Merge branch 'feature-flag-detail-limit_projects_in_groups_api' into 'master'

Add details about `limit_projects_in_groups_api` feature flag

See merge request gitlab-org/gitlab!43506

config/feature_flags/development/limit_projects_in_groups_api.yml

 ---
 name: limit_projects_in_groups_api
-introduced_by_url: 
-rollout_issue_url: 
-group: 
+introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/20023
+rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/257829
+group: group::access
 type: development
 default_enabled: true