Merge branch 'docs/code-owner-group-inheritance' into 'master'

Improve code owner group inheritance docs

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/118636



Merged-by: Amy Qualls <aqualls@gitlab.com>
Approved-by: Amy Qualls <aqualls@gitlab.com>
Co-authored-by: Joe Woodward <jwoodward@gitlab.com>