Modified note in about cert manager section.

Author: subhtk

modules/cert-manager-about.adoc

@@ -17,5 +17,7 @@ The {cert-manager-operator} provides the following features:
 
 [IMPORTANT]
 ====
-Do not attempt to use more than one cert-manager Operator in your cluster. If you have a community cert-manager Operator installed in your cluster, you must uninstall it before installing the {cert-manager-operator}.
+Do not attempt to use both {cert-manager-operator} for {product-title} and the community cert-manager Operator at the same time in your cluster.
+
+Also, you should not install {cert-manager-operator} for {product-title} in multiple namespaces within a single OpenShift cluster.
 ====