Merge branch 'ff-doc-web_ide_primary_edit' into 'master'

Update web_ide_primary_edit feature flag docs

See merge request gitlab-org/gitlab!43268

config/feature_flags/development/web_ide_primary_edit.yml

 ---
 name: web_ide_primary_edit
-introduced_by_url: 
+introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/35957
 rollout_issue_url: 
-group: 
+group: group::editor
 type: development
 default_enabled: false