Merge branch 'docs-feature-flags-core' into 'master'

Feature Flags moved to Core

See merge request gitlab-org/gitlab!44328

doc/operations/feature_flags.md

@@ -4,10 +4,11 @@ group: Progressive Delivery
 info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers
 ---
 
-# Feature Flags **(STARTER)**
+# Feature Flags **(CORE)**
 
 > - [Introduced](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/7433) in GitLab 11.4.
-> - [Moved](https://gitlab.com/gitlab-org/gitlab/-/issues/212318) to [GitLab Starter](https://about.gitlab.com/pricing/) in 13.4
+> - [Moved](https://gitlab.com/gitlab-org/gitlab/-/issues/212318) to [GitLab Starter](https://about.gitlab.com/pricing/) in 13.4.
+> - [Moved](https://gitlab.com/gitlab-org/gitlab/-/issues/212318) to [GitLab Core](https://about.gitlab.com/pricing/) in 13.5.
 
 With Feature Flags, you can deploy your application's new features to production in smaller batches.
 You can toggle a feature on and off to subsets of users, helping you achieve Continuous Delivery.