RC not avail in azure marketplace - known issue (#17321)

Author: amulyaraja

data/release-notes/3-0/0-rc.yml

@@ -134,6 +134,7 @@ sections:
     - '`ghe-config-apply` occassionally fails with `ERROR: Failure waiting for nomad jobs to apply` until the Nomad job queue is cleared. This currently requires as admin to delete `/etc/nomad-jobs/queue`.'
     - When configuring a multiple replica node, the status of the replica can be incorrectly synchronized.
     - Customers attempting to restore a 3.0 backup to a new instance should not pre-configure the instance, as it may lead to a bad state for user logins. We recommend restoring to a fresh, unconfigured instance.
+    - GitHub Enterprise Server 3.0 release candidates are not yet available in the Azure marketplace. To test RC1 in staging environments, start a 2.21 or 2.22 instance, and then upgrade it with the Azure upgrade package on the download page.
 
   backups:
     - '{% data variables.product.prodname_ghe_server %} 3.0 requires at least [GitHub Enterprise Backup Utilities 3.0.0](https://github.com/github/backup-utils) for [Backups and Disaster Recovery](/enterprise-server@3.0/admin/configuration/configuring-backups-on-your-appliance).'