Docs feedback: Docker Registry not mentioned in migration documentation

The migration documentation which lists the steps on how to migrate from the Omnibus- to the Helm-based installation mentions LFS, Artifacts and Uploads which need to be migrated to Object Storage first. While this is true, it doesn't mention the Docker Registry, which is not restored by backup-utility either.

There should be a note about this, and possibly a guide on how to migrate Registry data to S3 just like it is done with LFS, Artifacts and Uploads.