Add why not to patch the cluster before redfish strings are formed

Author: manasareddybethi

articles/operator-nexus/howto-configure-cluster.md

@@ -39,8 +39,8 @@ You should create the Network Fabric before this on-premises deployment.
 Each Operator Nexus on-premises instance has a one-to-one association
 with a Network Fabric.
 
-> [!NOTE]
-> After creating the cluster, avoid applying patches to it until the `az networkcloud cluster show` CLI command displays redfish bmcConnectionStrings for the corresponding cluster.
+> [!IMPORTANT]
+> After creating the cluster, avoid applying patches to it until the `az networkcloud cluster show` CLI command displays redfish bmcConnectionStrings for the corresponding cluster. Patching the cluster before these strings are generated can result in version overrides and the loss of bmcConnectionStrings from the cluster's Custom Resource.
 
 ### Create the Cluster using Azure CLI: