Fix docs for using object storage for storing artifacts
Related to https://gitlab.com/gitlab-org/omnibus-gitlab/issues/2640
What does this MR do?
Fix docs for using object storage for storing artifacts.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Related to https://gitlab.com/gitlab-org/omnibus-gitlab/issues/2640
Fix docs for using object storage for storing artifacts.