Merge branch 'mhamda/statistics-docs-update' into 'master'

Update docs for Groups REST API

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/117861



Merged-by: Fiona Neill <fneill@gitlab.com>
Approved-by: Fiona Neill <fneill@gitlab.com>
Reviewed-by: Mohamed Hamda <mhamda@gitlab.com>
Co-authored-by: Mohamed Hamda <mhamda@gitlab.com>