Merge branch 'docs/ngala-ff-link-for-pages' into 'master'

Docs: Update enable the feature flag link for pages

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/144082



Merged-by: Phillip Wells <pwells@gitlab.com>
Approved-by: Phillip Wells <pwells@gitlab.com>
Co-authored-by: Naman Jagdish Gala <ngala@gitlab.com>