Merge branch 'shem-project-settings-docs' into 'master'

Docs: Update project settings section to match its group counterpart

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/150801



Merged-by: Lorena Ciutacu <lciutacu@gitlab.com>
Co-authored-by: Shem Gyll <sgyll@gitlab.com>