Fix enforce_pat_expiration feature flag in docs

doc/user/admin_area/settings/account_and_limit_settings.md

@@ -159,19 +159,19 @@ To do this:
 
 ### Enable or disable optional enforcement of Personal Access Token expiry Feature **(CORE ONLY)**
 
-Optional Enforcement of Personal Access Token Expiry is under development and not ready for production use. It is deployed behind a feature flag that is **disabled by default**.
+Optional Enforcement of Personal Access Token Expiry is deployed behind a feature flag and is **disabled by default**.
 [GitLab administrators with access to the GitLab Rails console](../../../administration/feature_flags.md) can enable it for your instance from the [rails console](../../../administration/feature_flags.md#start-the-gitlab-rails-console).
 
 To enable it:
 
 ```ruby
-Feature.enable(:enforce_personal_access_token_expiration)
+Feature.enable(:enforce_pat_expiration)
 ```
 
 To disable it:
 
 ```ruby
-Feature.disable(:enforce_personal_access_token_expiration)
+Feature.disable(:enforce_pat_expiration)
 ```
 
 ## Disabling user profile name changes **(PREMIUM ONLY)**