Merge branch...

Merge branch '430258-document-geo-api-endpoint-geo-git_repositories-gl_repository-head' into 'master' 

Document API endpoint geo/repositories/:gl_repository/pipeline_refs

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/140251



Merged-by: Achilleas Pipinellis <axil@gitlab.com>
Approved-by: Douglas Barbosa Alexandre <dbalexandre@gmail.com>
Approved-by: Achilleas Pipinellis <axil@gitlab.com>
Reviewed-by: Achilleas Pipinellis <axil@gitlab.com>
Co-authored-by: Ian Baum <ibaum@gitlab.com>
Co-authored-by: Michael Kozono <mkozono@gitlab.com>