Merge pull request #77026 from dfitzmau/OCPBUGS-34127

OCPBUGS-34127: Updated the isolation modes nodes in OVN K8S docs

Author: ShaunaDiaz

modules/nw-ovn-kubernetes-migration-about.adoc

@@ -53,7 +53,7 @@ OVN-Kubernetes supports only the network policy isolation mode.
 
 [IMPORTANT]
 ====
-If your cluster uses OpenShift SDN configured in either the multitenant or subnet isolation modes, you cannot migrate to the OVN-Kubernetes network plugin.
+For a cluster using OpenShift SDN that is configured in either the multitenant or subnet isolation mode, you can still migrate to the OVN-Kubernetes network plugin. Note that after the migration operation, multitenant isolation mode is dropped, so you must manually configure network policies to achieve the same level of project-level isolation for pods and services.
 ====
 
 [discrete]