Follow-up from "Call out gitlab:uploads:migrate:all as the most common use case"

The following discussion from !41289 (merged) should be addressed:

• @msedlakjakubowski started a discussion:

  To follow up: add the following under https://gitlab.com/gitlab-org/gitlab-docs/blob/master/content/_data/default-nav.yaml#L1186-1187

              ee_only: true
              ee_tier: 'GitLab Core and higher tiers. Not available in GitLab.com'