Merge branch 'meziantou/gitlab-meziantou/docs/remove-prefix' into 'master'

Remove /api/v4 prefix

See merge request gitlab-org/gitlab!65727

doc/api/markdown.md

@@ -14,7 +14,7 @@ Available only in APIv4.
 ## Render an arbitrary Markdown document
 
 ```plaintext
-POST /api/v4/markdown
+POST /markdown
 ```
 
 | Attribute | Type    | Required      | Description                                |