Description of problem:
Need to update the RHEL upgrade methods in the Satellite upgrade guide under the chapter "Chapter 3. Upgrading Red Hat Enterprise Linux on Satellite or Capsule"

Currently, we have only 2 RHEL 8 to RHEL 9 upgrade methods

1. Leapp in-place upgrade
2. Migration by using backup and restore
 
We have another card for Sat6.16 to upgrade RHEL 9 using Satellite Clone https://issues.redhat.com/browse/SAT-19789, it should be mentioned in the guide.