Merge branch 'docs/pages-namespace-in-path' into 'master'

Docs: Support for namespace in path for pages

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/137289



Merged-by: Amy Qualls <aqualls@gitlab.com>
Approved-by: Alessio Caiazza <acaiazza@gitlab.com>
Reviewed-by: Alessio Caiazza <acaiazza@gitlab.com>
Co-authored-by: ngala <ngala@gitlab.com>