Add mentions of the new . shortcut

Build a few more cross-references for the new Web IDE shortcut
in the docs.

doc/user/project/merge_requests/index.md

@@ -83,9 +83,11 @@ can assign, categorize, and track progress on a merge request:
 ## Add changes to a merge request
 
 If you have permission to add changes to a merge request, you can add your changes
-to an existing merge request in several ways, depending on the complexity of your change and whether you need access to a development environment:
+to an existing merge request in several ways, depending on the complexity of your
+change and whether you need access to a development environment:
 
-- [Edit changes in the Web IDE](../web_ide/index.md) in your browser. Use this
+- [Edit changes in the Web IDE](../web_ide/index.md) in your browser with the
+  <kbd>.</kbd> [keyboard shortcut](../../shortcuts.md). Use this
   browser-based method to edit multiple files, or if you are not comfortable with Git commands.
   You cannot run tests from the Web IDE.
 - [Edit changes in Gitpod](../../../integration/gitpod.md#launch-gitpod-in-gitlab), if you

doc/user/project/web_ide/index.md

@@ -15,7 +15,8 @@ projects by providing an advanced editor with commit staging.
 
 ## Open the Web IDE
 
-You can open the Web IDE when viewing a file, from the repository file list,
+Use the <kbd>.</kbd> [keyboard shortcut](../../shortcuts.md) to open the Web IDE.
+You can also open the Web IDE when viewing a file, from the repository file list,
 and from merge requests:
 
 - *When viewing a file, or the repository file list* -

doc/user/shortcuts.md

@@ -43,6 +43,7 @@ These shortcuts are available in most areas of GitLab:
 | <kbd>Shift</kbd> + <kbd>t</kbd> | Go to your To-Do List page. |
 | <kbd>p</kbd> + <kbd>b</kbd>     | Show or hide the Performance Bar. |
 | <kbd>g</kbd> + <kbd>x</kbd>     | Toggle between [GitLab](https://gitlab.com/) and [GitLab Next](https://next.gitlab.com/) (GitLab SaaS only). |
+| <kbd>.</kbd>     | Open the [Web IDE](project/web_ide/index.md). |
 
 Additionally, the following shortcuts are available when editing text in text
 fields (for example, comments, replies, issue descriptions, and merge request
@@ -101,6 +102,7 @@ These shortcuts are available when viewing issues and [merge requests](project/m
 | <kbd>]</kbd> or <kbd>j</kbd> | Move to next file (merge requests only). |
 | <kbd>[</kbd> or <kbd>k</kbd> | Move to previous file (merge requests only). |
 | <kbd>b</kbd>                 | Copy source branch name (merge requests only). |
+| <kbd>.</kbd>     | Open the [Web IDE](project/web_ide/index.md). |
 
 ### Project files
 
@@ -114,6 +116,7 @@ These shortcuts are available when browsing the files in a project (go to
 | <kbd>enter</kbd>  | Open selection. |
 | <kbd>Escape</kbd> | Go back to file list screen (only while searching for files, **Repository > Files**, then select **Find File**). |
 | <kbd>y</kbd>      | Go to file permalink (only while viewing a file). |
+| <kbd>.</kbd>     | Open the [Web IDE](project/web_ide/index.md). |
 
 ### Web IDE