Merge branch 'doc-enable-squash-option-by-default' into 'master'

Update squash  docs to be enabled by default

See merge request gitlab-org/gitlab!39384

doc/user/project/merge_requests/squash_and_merge.md

@@ -92,10 +92,10 @@ squashing can itself be considered equivalent to rebasing.
 ## Squash Commits Options
 
 > - [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/17613) in GitLab 13.2.
-> - It's deployed behind a feature flag, disabled by default.
-> - It's disabled on GitLab.com.
-> - It's not recommended for production use.
-> - To use it in GitLab self-managed instances, ask a GitLab administrator to [enable it](#enable-or-disable-squash-commit-options-core-only). **(CORE ONLY)**
+> - It's deployed behind a feature flag, enabled by default.
+> - It's enabled on GitLab.com.
+> - It's recommended for production use.
+> - For GitLab self-managed instances, GitLab administrator can opt to [disable it](#enable-or-disable-squash-commit-options-core-only). **(CORE ONLY)**
 
 With Squash Commits Options you can configure the behavior of Squash and Merge for your project.
 To set it up, navigate to your project's **Settings > General** and expand **Merge requests**.
@@ -120,8 +120,8 @@ squash commits locally through the command line and force-push to their remote b
 
 ### Enable or disable Squash Commit Options **(CORE ONLY)**
 
-Squash Commit Options is under development and not ready for production use. It is
-deployed behind a feature flag that is **disabled by default**.
+Squash Commit Options is ready for production use. It is
+deployed behind a feature flag that is **enabled by default**.
 [GitLab administrators with access to the GitLab Rails console](../../../administration/feature_flags.md)
 can enable it for your instance. Squash Commit Options can be enabled or disabled per-project.