docs: add cluster update note (#728)

Added to readme for use in GH. Added to ROKS pattern so that it displays in the Cloud catalog.

Author: SirSpidey

README.md

@@ -688,6 +688,8 @@ list(
 
 You can create as many `iks` or `openshift` clusters and worker pools on VPC. For `ROKS` clusters, make sure to enable public gateways to allow your cluster to correctly provision ingress application load balancers.
 
+:exclamation: **Important:** You can't update Red Hat OpenShift cluster nodes by using this module. The Terraform logic ignores updates to prevent possible destructive changes.
+
 The following example shows the `cluster` variable type.
 
 ```terraform

patterns/roks/README.md

@@ -4,4 +4,6 @@
 
 This architecture supports the creation of a Red Hat OpenShift Container Platform on VPC landing zone in a single region architecture on IBM Cloud.
 
+You can't update Red Hat OpenShift cluster nodes by using this variation. The Terraform logic ignores updates to prevent possible destructive changes. Update the cluster outside of the Terraform code.
+
 :exclamation: **Important:** The controls `SC-13(0)`, `SC-28(0)` and `SC-28(1)(0)` can be met if Hyper Protect Crypto Service is used as the Key Management solution.