Merge branch 'ps-docs-for-rop-settings-dependencies' into 'master'

Add docs for dependencies in settings railway

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/177625



Merged-by: Chad Woolley <cwoolley@gitlab.com>
Approved-by: Chad Woolley <cwoolley@gitlab.com>
Reviewed-by: Chad Woolley <cwoolley@gitlab.com>
Co-authored-by: Paul Slaughter <pslaughter@gitlab.com>