Docs: Update API code blocks

The code blocks for each API call on these pages did not specify a
code style. Most are HTTP requests for API calls.

doc/api/import.md

@@ -4,7 +4,7 @@
 
 Import your projects from GitHub to GitLab via the API.
 
-```
+```plaintext
 POST /import/github
 ```
 

doc/api/issue_links.md

@@ -5,7 +5,7 @@
 Get a list of related issues of a given issue, sorted by the relationship creation datetime (ascending).
 Issues will be filtered according to the user authorizations.
 
-```
+```plaintext
 GET /projects/:id/issues/:issue_iid/links
 ```
 
@@ -57,7 +57,7 @@ Parameters:
 
 Creates a two-way relation between two issues. User must be allowed to update both issues in order to succeed.
 
-```
+```plaintext
 POST /projects/:id/issues/:issue_iid/links
 ```
 
@@ -145,7 +145,7 @@ Example response:
 
 Deletes an issue link, thus removes the two-way relationship.
 
-```
+```plaintext
 DELETE /projects/:id/issues/:issue_iid/links/:issue_link_id
 ```
 

doc/api/issues.md

@@ -26,7 +26,7 @@ Get all issues the authenticated user has access to. By default it
 returns only issues created by the current user. To get all issues,
 use parameter `scope=all`.
 
-```
+```plaintext
 GET /issues
 GET /issues?state=opened
 GET /issues?state=closed
@@ -181,7 +181,7 @@ the `weight` parameter:
 
 Get a list of a group's issues.
 
-```
+```plaintext
 GET /groups/:id/issues
 GET /groups/:id/issues?state=opened
 GET /groups/:id/issues?state=closed
@@ -336,7 +336,7 @@ the `weight` parameter:
 
 Get a list of a project's issues.
 
-```
+```plaintext
 GET /projects/:id/issues
 GET /projects/:id/issues?state=opened
 GET /projects/:id/issues?state=closed
@@ -497,7 +497,7 @@ the `weight` parameter:
 
 Get a single project issue.
 
-```
+```plaintext
 GET /projects/:id/issues/:issue_iid
 ```
 
@@ -637,7 +637,7 @@ Please use `iid` of the `epic` attribute instead.
 
 Creates a new project issue.
 
-```
+```plaintext
 POST /projects/:id/issues
 ```
 
@@ -745,7 +745,7 @@ the `weight` parameter:
 Updates an existing project issue. This call is also used to mark an issue as
 closed.
 
-```
+```plaintext
 PUT /projects/:id/issues/:issue_iid
 ```
 
@@ -864,7 +864,7 @@ The `closed_by` attribute was [introduced in GitLab 10.6][ce-17042]. This value
 
 Only for admins and project owners. Deletes the issue in question.
 
-```
+```plaintext
 DELETE /projects/:id/issues/:issue_iid
 ```
 
@@ -886,7 +886,7 @@ issue, error `400` together with an explaining error message is returned.
 If a given label and/or milestone with the same name also exists in the target
 project, it will then be assigned to the issue that is being moved.
 
-```
+```plaintext
 POST /projects/:id/issues/:issue_iid/move
 ```
 
@@ -993,7 +993,7 @@ Subscribes the authenticated user to an issue to receive notifications.
 If the user is already subscribed to the issue, the status code `304`
 is returned.
 
-```
+```plaintext
 POST /projects/:id/issues/:issue_iid/subscribe
 ```
 
@@ -1099,7 +1099,7 @@ Unsubscribes the authenticated user from the issue to not receive notifications
 from it. If the user is not subscribed to the issue, the
 status code `304` is returned.
 
-```
+```plaintext
 POST /projects/:id/issues/:issue_iid/unsubscribe
 ```
 
@@ -1170,7 +1170,7 @@ Manually creates a todo for the current user on an issue. If
 there already exists a todo for the user on that issue, status code `304` is
 returned.
 
-```
+```plaintext
 POST /projects/:id/issues/:issue_iid/todo
 ```
 
@@ -1284,7 +1284,7 @@ Example response:
 
 Sets an estimated time of work for this issue.
 
-```
+```plaintext
 POST /projects/:id/issues/:issue_iid/time_estimate
 ```
 
@@ -1313,7 +1313,7 @@ Example response:
 
 Resets the estimated time for this issue to 0 seconds.
 
-```
+```plaintext
 POST /projects/:id/issues/:issue_iid/reset_time_estimate
 ```
 
@@ -1341,7 +1341,7 @@ Example response:
 
 Adds spent time for this issue
 
-```
+```plaintext
 POST /projects/:id/issues/:issue_iid/add_spent_time
 ```
 
@@ -1370,7 +1370,7 @@ Example response:
 
 Resets the total spent time for this issue to 0 seconds.
 
-```
+```plaintext
 POST /projects/:id/issues/:issue_iid/reset_spent_time
 ```
 
@@ -1396,7 +1396,7 @@ Example response:
 
 ## Get time tracking stats
 
-```
+```plaintext
 GET /projects/:id/issues/:issue_iid/time_stats
 ```
 
@@ -1424,7 +1424,7 @@ Example response:
 
 Get all the merge requests that are related to the issue.
 
-```
+```plaintext
 GET /projects/:id/issues/:issue_id/related_merge_requests
 ```
 
@@ -1580,7 +1580,7 @@ Example response:
 
 Get all the merge requests that will close issue when merged.
 
-```
+```plaintext
 GET /projects/:id/issues/:issue_iid/closed_by
 ```
 
@@ -1653,7 +1653,7 @@ Example response:
 
 ## Participants on issues
 
-```
+```plaintext
 GET /projects/:id/issues/:issue_iid/participants
 ```
 
@@ -1697,7 +1697,7 @@ Comments are done via the [notes](notes.md) resource.
 
 Available only for admins.
 
-```
+```plaintext
 GET /projects/:id/issues/:issue_iid/user_agent_detail
 ```
 

doc/api/issues_statistics.md

@@ -11,7 +11,7 @@ Gets issues count statistics on all issues the authenticated user has access to.
 returns only issues created by the current user. To get all issues,
 use parameter `scope=all`.
 
-```
+```plaintext
 GET /issues_statistics
 GET /issues_statistics?labels=foo
 GET /issues_statistics?labels=foo,bar
@@ -67,7 +67,7 @@ Example response:
 
 Gets issues count statistics for given group.
 
-```
+```plaintext
 GET /groups/:id/issues_statistics
 GET /groups/:id/issues_statistics?labels=foo
 GET /groups/:id/issues_statistics?labels=foo,bar

doc/api/jobs.md

@@ -4,7 +4,7 @@
 
 Get a list of jobs in a project. Jobs are sorted in descending order of their IDs.
 
-```
+```plaintext
 GET /projects/:id/jobs
 ```
 
@@ -138,7 +138,7 @@ Example of response
 
 Get a list of jobs for a pipeline.
 
-```
+```plaintext
 GET /projects/:id/pipelines/:pipeline_id/jobs
 ```
 
@@ -273,7 +273,7 @@ Example of response
 
 Get a single job of a project
 
-```
+```plaintext
 GET /projects/:id/jobs/:job_id
 ```
 
@@ -351,7 +351,7 @@ Example of response
 
 Get the job's artifacts zipped archive of a project.
 
-```
+```plaintext
 GET /projects/:id/jobs/:job_id/artifacts
 ```
 
@@ -414,7 +414,7 @@ the given reference name and job, provided the job finished successfully. This
 is the same as [getting the job's artifacts](#get-job-artifacts), but by
 defining the job's name instead of its ID.
 
-```
+```plaintext
 GET /projects/:id/jobs/artifacts/:ref_name/download?job=name
 ```
 
@@ -476,7 +476,7 @@ Download a single artifact file from a job with a specified ID from within
 the job's artifacts zipped archive. The file is extracted from the archive and
 streamed to the client.
 
-```
+```plaintext
 GET /projects/:id/jobs/:job_id/artifacts/*artifact_path
 ```
 
@@ -510,7 +510,7 @@ Download a single artifact file for a specific job of the latest successful
 pipeline for the given reference name from within the job's artifacts archive.
 The file is extracted from the archive and streamed to the client.
 
-```
+```plaintext
 GET /projects/:id/jobs/artifacts/:ref_name/raw/*artifact_path?job=name
 ```
 
@@ -541,7 +541,7 @@ Possible response status codes:
 
 Get a log (trace) of a specific job of a project:
 
-```
+```plaintext
 GET /projects/:id/jobs/:job_id/trace
 ```
 
@@ -565,7 +565,7 @@ Possible response status codes:
 
 Cancel a single job of a project
 
-```
+```plaintext
 POST /projects/:id/jobs/:job_id/cancel
 ```
 
@@ -614,7 +614,7 @@ Example of response
 
 Retry a single job of a project
 
-```
+```plaintext
 POST /projects/:id/jobs/:job_id/retry
 ```
 
@@ -663,7 +663,7 @@ Example of response
 
 Erase a single job of a project (remove job artifacts and a job log)
 
-```
+```plaintext
 POST /projects/:id/jobs/:job_id/erase
 ```
 
@@ -717,7 +717,7 @@ Example of response
 
 Prevents artifacts from being deleted when expiration is set.
 
-```
+```plaintext
 POST /projects/:id/jobs/:job_id/artifacts/keep
 ```
 
@@ -773,7 +773,7 @@ Example response:
 
 Delete artifacts of a job.
 
-```
+```plaintext
 DELETE /projects/:id/jobs/:job_id/artifacts
 ```
 
@@ -797,7 +797,7 @@ If the artifacts were deleted successfully, a response with status `204 No Conte
 
 Triggers a manual action to start a job.
 
-```
+```plaintext
 POST /projects/:id/jobs/:job_id/play
 ```
 

doc/api/labels.md

@@ -7,7 +7,7 @@ The `description_html` - was added to response JSON in [GitLab 12.7](https://git
 
 Get all labels for a given project.
 
-```
+```plaintext
 GET /projects/:id/labels
 ```
 
@@ -102,7 +102,7 @@ Example response:
 
 Get a single label for a given project.
 
-```
+```plaintext
 GET /projects/:id/labels/:label_id
 ```
 
@@ -139,7 +139,7 @@ Example response:
 
 Creates a new label for the given repository with the given name and color.
 
-```
+```plaintext
 POST /projects/:id/labels
 ```
 
@@ -178,7 +178,7 @@ Example response:
 
 Deletes a label with a given name.
 
-```
+```plaintext
 DELETE /projects/:id/labels/:label_id
 ```
 
@@ -198,7 +198,7 @@ NOTE: **Note:** An older endpoint `DELETE /projects/:id/labels` with `name` in t
 Updates an existing label with new name or new color. At least one parameter
 is required, to update the label.
 
-```
+```plaintext
 PUT /projects/:id/labels/:label_id
 ```
 
@@ -242,7 +242,7 @@ NOTE: **Note:** An older endpoint `PUT /projects/:id/labels` with `name` or `lab
 
 Promotes a project label to a group label.
 
-```
+```plaintext
 PUT /projects/:id/labels/:label_id/promote
 ```
 
@@ -279,7 +279,7 @@ Subscribes the authenticated user to a label to receive notifications.
 If the user is already subscribed to the label, the status code `304`
 is returned.
 
-```
+```plaintext
 POST /projects/:id/labels/:label_id/subscribe
 ```
 
@@ -317,7 +317,7 @@ Unsubscribes the authenticated user from a label to not receive notifications
 from it. If the user is not subscribed to the label, the
 status code `304` is returned.
 
-```
+```plaintext
 POST /projects/:id/labels/:label_id/unsubscribe
 ```
 

doc/api/license.md

@@ -5,7 +5,7 @@ as an admin.
 
 ## Retrieve information about the current license
 
-```
+```plaintext
 GET /license
 ```
 
@@ -34,7 +34,7 @@ GET /license
 
 ## Retrieve information about all licenses
 
-```
+```plaintext
 GET /licenses
 ```
 
@@ -93,7 +93,7 @@ Returns:
 
 ## Add a new license
 
-```
+```plaintext
 POST /license
 ```
 
@@ -137,7 +137,7 @@ Returns:
 
 ## Delete a license
 
-```
+```plaintext
 DELETE /license/:id
 ```
 

doc/api/lint.md

@@ -4,7 +4,7 @@
 
 Checks if your `.gitlab-ci.yml` file is valid.
 
-```
+```plaintext
 POST /ci/lint
 ```
 

doc/api/managed_licenses.md

@@ -4,7 +4,7 @@
 
 Get all managed licenses for a given project.
 
-```
+```plaintext
 GET /projects/:id/managed_licenses
 ```
 
@@ -37,7 +37,7 @@ Example response:
 
 Shows an existing managed license.
 
-```
+```plaintext
 GET /projects/:id/managed_licenses/:managed_license_id
 ```
 
@@ -64,7 +64,7 @@ Example response:
 
 Creates a new managed license for the given project with the given name and approval status.
 
-```
+```plaintext
 POST /projects/:id/managed_licenses
 ```
 
@@ -92,7 +92,7 @@ Example response:
 
 Deletes a managed license with a given id.
 
-```
+```plaintext
 DELETE /projects/:id/managed_licenses/:managed_license_id
 ```
 
@@ -111,7 +111,7 @@ When successful, it replies with an HTTP 204 response.
 
 Updates an existing managed license with a new approval status.
 
-```
+```plaintext
 PATCH /projects/:id/managed_licenses/:managed_license_id
 ```
 

doc/api/markdown.md

@@ -6,7 +6,7 @@ Available only in APIv4.
 
 ## Render an arbitrary Markdown document
 
-```
+```plaintext
 POST /api/v4/markdown
 ```
 

doc/api/members.md

@@ -17,7 +17,7 @@ The access levels are defined in the `Gitlab::Access` module. Currently, these l
 Gets a list of group or project members viewable by the authenticated user.
 Returns only direct members and not inherited members through ancestors groups.
 
-```
+```plaintext
 GET /groups/:id/members
 GET /projects/:id/members
 ```
@@ -72,7 +72,7 @@ Gets a list of group or project members viewable by the authenticated user, incl
 When a user is a member of the project/group and of one or more ancestor groups the user is returned only once with the project `access_level` (if exists)
 or the `access_level` for the user in the first group which they belong to in the project groups ancestors chain.
 
-```
+```plaintext
 GET /groups/:id/members/all
 GET /projects/:id/members/all
 ```
@@ -136,7 +136,7 @@ Example response:
 
 Gets a member of a group or project. Returns only direct members and not inherited members through ancestor groups.
 
-```
+```plaintext
 GET /groups/:id/members/:user_id
 GET /projects/:id/members/:user_id
 ```
@@ -173,7 +173,7 @@ Example response:
 
 Gets a member of a group or project, including members inherited through ancestor groups. See the corresponding [endpoint to list all inherited members](#list-all-members-of-a-group-or-project-including-inherited-members) for details.
 
-```
+```plaintext
 GET /groups/:id/members/all/:user_id
 GET /projects/:id/members/all/:user_id
 ```
@@ -208,7 +208,7 @@ Example response:
 
 Adds a member to a group or project.
 
-```
+```plaintext
 POST /groups/:id/members
 POST /projects/:id/members
 ```
@@ -245,7 +245,7 @@ Example response:
 
 Updates a member of a group or project.
 
-```
+```plaintext
 PUT /groups/:id/members/:user_id
 PUT /projects/:id/members/:user_id
 ```
@@ -282,7 +282,7 @@ Example response:
 
 Removes a user from a group or project.
 
-```
+```plaintext
 DELETE /groups/:id/members/:user_id
 DELETE /projects/:id/members/:user_id
 ```

doc/api/merge_request_approvals.md

@@ -11,7 +11,7 @@ Configuration for approvals on all Merge Requests (MR) in the project. Must be a
 You can request information about a project's approval configuration using the
 following endpoint:
 
-```
+```plaintext
 GET /projects/:id/approvals
 ```
 
@@ -39,7 +39,7 @@ GET /projects/:id/approvals
 If you are allowed to, you can change approval configuration using the following
 endpoint:
 
-```
+```plaintext
 POST /projects/:id/approvals
 ```
 
@@ -73,7 +73,7 @@ POST /projects/:id/approvals
 
 You can request information about a project's approval rules using the following endpoint:
 
-```
+```plaintext
 GET /projects/:id/approval_rules
 ```
 
@@ -172,7 +172,7 @@ GET /projects/:id/approval_rules
 
 You can create project approval rules using the following endpoint:
 
-```
+```plaintext
 POST /projects/:id/approval_rules
 ```
 
@@ -274,7 +274,7 @@ POST /projects/:id/approval_rules
 
 You can update project approval rules using the following endpoint:
 
-```
+```plaintext
 PUT /projects/:id/approval_rules/:approval_rule_id
 ```
 
@@ -379,7 +379,7 @@ PUT /projects/:id/approval_rules/:approval_rule_id
 
 You can delete project approval rules using the following endpoint:
 
-```
+```plaintext
 DELETE /projects/:id/approval_rules/:approval_rule_id
 ```
 
@@ -398,7 +398,7 @@ DELETE /projects/:id/approval_rules/:approval_rule_id
 If you are allowed to, you can change approvers and approver groups using
 the following endpoint:
 
-```
+```plaintext
 PUT /projects/:id/approvers
 ```
 
@@ -464,7 +464,7 @@ Configuration for approvals on a specific Merge Request. Must be authenticated f
 You can request information about a merge request's approval status using the
 following endpoint:
 
-```
+```plaintext
 GET /projects/:id/merge_requests/:merge_request_iid/approvals
 ```
 
@@ -510,7 +510,7 @@ GET /projects/:id/merge_requests/:merge_request_iid/approvals
 If you are allowed to, you can change `approvals_required` using the following
 endpoint:
 
-```
+```plaintext
 POST /projects/:id/merge_requests/:merge_request_iid/approvals
 ```
 
@@ -547,7 +547,7 @@ POST /projects/:id/merge_requests/:merge_request_iid/approvals
 If you are allowed to, you can change approvers and approver groups using
 the following endpoint:
 
-```
+```plaintext
 PUT /projects/:id/merge_requests/:merge_request_iid/approvers
 ```
 
@@ -617,7 +617,7 @@ PUT /projects/:id/merge_requests/:merge_request_iid/approvers
 
 You can request information about a merge request's approval state by using the following endpoint:
 
-```
+```plaintext
 GET /projects/:id/merge_requests/:merge_request_iid/approval_state
 ```
 
@@ -688,7 +688,7 @@ This includes additional information about the users who have already approved
 
 You can request information about a merge request's approval rules using the following endpoint:
 
-```
+```plaintext
 GET /projects/:id/merge_requests/:merge_request_iid/approval_rules
 ```
 
@@ -764,7 +764,7 @@ GET /projects/:id/merge_requests/:merge_request_iid/approval_rules
 
 You can create merge request approval rules using the following endpoint:
 
-```
+```plaintext
 POST /projects/:id/merge_requests/:merge_request_iid/approval_rules
 ```
 
@@ -847,7 +847,7 @@ will be used.
 
 You can update merge request approval rules using the following endpoint:
 
-```
+```plaintext
 PUT /projects/:id/merge_requests/:merge_request_iid/approval_rules/:approval_rule_id
 ```
 
@@ -931,7 +931,7 @@ These are system generated rules.
 
 You can delete merge request approval rules using the following endpoint:
 
-```
+```plaintext
 DELETE /projects/:id/merge_requests/:merge_request_iid/approval_rules/:approval_rule_id
 ```
 
@@ -953,7 +953,7 @@ These are system generated rules.
 If you are allowed to, you can approve a merge request using the following
 endpoint:
 
-```
+```plaintext
 POST /projects/:id/merge_requests/:merge_request_iid/approve
 ```
 
@@ -1016,7 +1016,7 @@ does not match, the response code will be `409`.
 If you did approve a merge request, you can unapprove it using the following
 endpoint:
 
-```
+```plaintext
 POST /projects/:id/merge_requests/:merge_request_iid/unapprove
 ```