Merge branch 'vij-adjust-bbm-deletion-docs' into 'master'

Add re-queuing note to batched migration deletion

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/171394



Merged-by: Leonardo da Rosa <ldarosa@gitlab.com>
Approved-by: Leonardo da Rosa <ldarosa@gitlab.com>
Reviewed-by: Leonardo da Rosa <ldarosa@gitlab.com>
Co-authored-by: Vijay Hawoldar <vhawoldar@gitlab.com>

doc/development/database/batched_background_migrations.md

@@ -307,8 +307,9 @@ migration code should be.
 
 ### Deleting batched background migration code
 
-Once a batched background migration has been finalized, the migration code in `lib/gitlab/background_migration/`
-and its associated tests can be deleted after the next required stop following the finalization.
+Once a batched background migration has completed, is finalized and has not been [re-queued](#re-queue-batched-background-migrations),
+the migration code in `lib/gitlab/background_migration/` and its associated tests can be deleted after the next required stop following
+the finalization.
 
 Here is an example scenario: