Re-did the feature flag details

doc/user/admin_area/settings/help_page.md

@@ -61,14 +61,12 @@ You can specify a custom URL to which users are directed when they:
 ## Redirect GitLab documentation links
 
 > - [Introduced](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/43157) in GitLab 13.5.
-> - [Deployed behind a feature flag](../../feature_flags.md), disabled by default.
-> - Enabled on GitLab.com.
-> - Ready for production use.
-> - To use in GitLab self-managed instances, ask a GitLab administrator to [enable it](#enable-or-disable-gitlab-documentation-link-redirects). **(FREE SELF)**
+> - Enabled on GitLab.com and is ready for production use. Available to GitLab.com administrators only.
 
-This in-development feature might not be available for your use. There can be
-[risks when enabling features still in development](../../../administration/feature_flags.md#risks-when-enabling-features-still-in-development).
-Refer to this feature's version history for more details.
+NOTE:
+On self-managed GitLab, by default this feature is not available. To make it available, ask an administrator to
+[enable the `:help_page_documentation_redirect` flag](../../../administration/feature_flags.md).
+On GitLab.com, this feature is available but can be configured by GitLab.com administrators only.
 
 Documentation links go to the `/help` section on the instance by default, but you can
 redirect these links to an external documentation site like `https://docs.gitlab.com`:
@@ -78,25 +76,6 @@ redirect these links to an external documentation site like `https://docs.gitlab
 1. Enter the URL in the **Documentation pages URL** field.
 1. Select **Save changes**.
 
-### Enable or disable GitLab documentation link redirects **(FREE SELF)**
-
-The GitLab documentation link redirects feature is under development and not ready
-for production use. It is deployed behind a feature flag that is **disabled by default**.
-[GitLab administrators with access to the GitLab Rails console](../../../administration/feature_flags.md)
-can enable it.
-
-To enable it:
-
-```ruby
-Feature.enable(:help_page_documentation_redirect)
-```
-
-To disable it:
-
-```ruby
-Feature.disable(:help_page_documentation_redirect)
-```
-
 <!-- ## Troubleshooting
 
 Include any troubleshooting steps that you can foresee. If you know beforehand what issues