Merge branch '497504-update-codeowner-role-approver-doc' into 'master'

Update docs for feature flag rollout

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/175830



Merged-by: Brendan Lynch <blynch@gitlab.com>
Approved-by: Brendan Lynch <blynch@gitlab.com>
Reviewed-by: Brendan Lynch <blynch@gitlab.com>
Co-authored-by: ghinfey <ghinfey@gitlab.com>