Docs: Fix 4 docs to resolve follow-up issue

doc/api/epic_issues.md

@@ -7,6 +7,7 @@ If a user is not a member of a group and the group is private, a `GET` request o
 Epics are available only in Ultimate. If epics feature is not available a `403` status code will be returned.
 
 ## List issues for an epic
+
 Gets all issues that are assigned to an epic and the authenticated user has  access to.
 
 ```

doc/api/epic_links.md

@@ -12,6 +12,7 @@ If a user is not a member of a group and the group is private, a `GET` request o
 Epics are available only in the [Ultimate/Gold tier](https://about.gitlab.com/pricing/). If the epics feature is not available, a `403` status code will be returned.
 
 ## List epics related to a given epic
+
 Gets all child epics of an epic.
 
 ```

doc/api/scim.md

-# SCIM API
+# SCIM API **[SILVER ONLY]**
 
 > [Introduced](https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/9388) in [GitLab Silver](https://about.gitlab.com/pricing/) 11.10.
 

doc/api/vulnerabilities.md

-# Vulnerabilities API
+# Vulnerabilities API **[ULTIMATE]**
 
 Every API call to vulnerabilities must be authenticated.