Bring search settings flag up to style spec

Update the search settings flag on this page to use the current
styling.

doc/user/search/index.md

@@ -321,9 +321,10 @@ GitLab instance.
 
 ## Search settings
 
-> - [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/292941) in GitLab 13.8 behind a feature flag, disabled by default.
+> - [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/292941) in GitLab 13.8 [with a flag](../../administration/feature_flags.md) named `search_settings_in_page`. Disabled by default.
 > - [Added to Group, Administrator, and User settings](https://gitlab.com/groups/gitlab-org/-/epics/4842) in GitLab 13.9.
-> - [Enabled by default](https://gitlab.com/gitlab-org/gitlab/-/issues/294025) in GitLab 13.11.
+> - [Feature flag `search_settings_in_page` removed](https://gitlab.com/gitlab-org/gitlab/-/issues/294025) in GitLab 13.11.
+> - [Generally available](https://gitlab.com/gitlab-org/gitlab/-/issues/294025) in GitLab 13.11.
 
 You can search inside a Project, Group, Administrator, or User's settings by entering
 a search term in the search box located at the top of the page. The search results