Merge branch 'docs/expiration-policy-latest-shared-image-ids' into 'master'

Tags using the same image ID as latest are not deleted

See merge request gitlab-org/gitlab!31173

doc/user/packages/container_registry/index.md

@@ -552,10 +552,12 @@ being cleaned up will be minimal.
 
 ## Limitations
 
-Moving or renaming existing Container Registry repositories is not supported
+- Moving or renaming existing Container Registry repositories is not supported
 once you have pushed images, because the images are signed, and the
 signature includes the repository name. To move or rename a repository with a
 Container Registry, you will have to delete all existing images.
+- Prior to GitLab 12.10, any tags that use the same image ID as the `latest` tag
+will not be deleted by the expiration policy.
 
 ## Troubleshooting the GitLab Container Registry