Merge pull request #38061 from kelbrown20/notes-section-for-image-registry-section-1927776

BZ:1927776 - Adding clarification for regionEndpoint section

Author: mburke5678

modules/registry-operator-configuration-resource-overview-aws-s3.adoc

@@ -43,3 +43,12 @@ true, or this parameter is ignored.
 It is optional.
 
 |===
+
+[NOTE]
+====
+When the value of the `regionEndpoint` parameter is configured to a URL of a Rados Gateway, an explicit port must not be specified. For example:
+[source,yaml]
+----
+regionEndpoint: http://rook-ceph-rgw-ocs-storagecluster-cephobjectstore.openshift-storage.svc.cluster.local
+----
+====