Update documentation related to depend_on_persistent_pipeline_ref

doc/ci/pipelines.md

@@ -469,14 +469,13 @@ To illustrate its life cycle:
 1. GitLab Runner fetches the persistent pipeline ref and gets source code from the checkout-SHA.
 1. When the pipeline finished, its persistent ref is cleaned up in a background process.
 
-NOTE: **NOTE**: At this moment, this feature is off dy default and can be manually enabled
-by enabling `depend_on_persistent_pipeline_ref` feature flag, however, we'd remove this
-feature flag and make it enabled by deafult by the day we release 12.4 _if we don't find any issues_.
-If you'd be interested in manually turning on this behavior, please ask the administrator
+NOTE: **NOTE**: At this moment, this feature is on dy default and can be manually disabled
+by disabling `depend_on_persistent_pipeline_ref` feature flag. If you'd be interested in
+manually disabling this behavior, please ask the administrator
 to execute the following commands in rails console.
 
 ```shell
 > sudo gitlab-rails console                                        # Login to Rails console of GitLab instance.
 > project = Project.find_by_full_path('namespace/project-name')    # Get the project instance.
-> Feature.enable(:depend_on_persistent_pipeline_ref, project)      # Enable the feature flag.
+> Feature.disable(:depend_on_persistent_pipeline_ref, project)     # Disable the feature flag.
 ```