Merge pull request #56116 from xenolinux/required

OCPBUGS#2154: Mirroring release images to a separate repository is a requirement than a recommendation.

Author: stevsmit

modules/update-service-mirror-release.adoc

@@ -7,7 +7,7 @@
 
 [IMPORTANT]
 ====
-To avoid excessive memory usage by the OpenShift Update Service application, it is recommended that you mirror release images to a separate repository, as described in the following procedure.
+To avoid excessive memory usage by the OpenShift Update Service application, it is required that you mirror release images to a separate repository, as described in the following procedure.
 ====
 
 .Prerequisites