Merge branch 'docs-relative-links-info' into 'master'

Add clarifications about relative links

See merge request gitlab-org/gitlab!53222

doc/development/documentation/styleguide/index.md

@@ -997,7 +997,8 @@ To link to internal documentation:
 - Use relative links to Markdown files in the same repository.
 - Do not use absolute URLs or URLs from `docs.gitlab.com`.
 - Use `../` to navigate to higher-level directories.
-- Don't prepend `./` to links to files or directories.
+- Don't prepend `./` to links to files or directories. To link to a file in the
+  same directory or one of its sub-directories, use the syntax `path/to/file.md`.
 - Don't link relative to root. For example, `/ee/user/gitlab_com/index.md`.
 
   Don't:
@@ -1022,6 +1023,7 @@ To link to internal documentation:
   - `../../merge_requests/index.md`
   - `../../issues/tags.md`
   - `../../issues/tags.md#stages`
+  - `issues/tags.md`
 
 NOTE:
 Using the Markdown extension is necessary for the [`/help`](../index.md#gitlab-help)