adds an admonition

Author: Amrita

modules/installation-restricted-network-samples.adoc

@@ -29,6 +29,11 @@ part of the install payload, are not managed by the Cluster Samples Operator. Th
 not addressed in this procedure.
 ====
 
+[IMPORTANT]
+====
+The Cluster Samples Operator must be set to `Managed` in a disconnected environment. To install the image streams, you have a mirrored registry.
+====
+
 .Prerequisites
 * Access to the cluster as a user with the `cluster-admin` role.
 * Create a pull secret for your mirror registry.