Revises per copy review.

Author: erabil-mdb

source/atlas-cli-changelog.txt

@@ -25,6 +25,7 @@ Released 6 December 2023
 - Adds :ref:`atlas-backups-compliancePolicy` 
   commands so that you can set up and manage a cloud backup compliance policy 
   for your project. To learn more, see :ref:`backup-compliance-policy`.
+- Drops support for :atlas:`{+ak8so+} </atlas-operator>` 1.x.
 
 .. _atlas-cli-1.13.0: