Docs: Add reviewer values

doc/development/index.md

@@ -143,6 +143,13 @@ In these cases, use the following workflow:
    for final content review and merge. The Technical Writer may ask for
    additional approvals as previously suggested before merging the MR.
 
+### Reviewer values
+
+> [Introduced](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/57293) in GitLab 14.1.
+
+As a reviewer or as a reviewee, make sure to familiarize yourself with
+the [reviewer values](https://about.gitlab.com/handbook/engineering/workflow/reviewer-values/) we strive for at GitLab.
+
 ## UX and Frontend guides
 
 - [GitLab Design System](https://design.gitlab.com/), for building GitLab with