Inaccurate diagram for openshift flavor


https://github.com/terraform-ibm-modules/terraform-ibm-landing-zone/blob/main/patterns/roks/README.md

It looks as if there are 6 clusters, when in reality there are 2 clusters.

Suggest to add the mention **worker nodes** in each zone, and add a box showing that the worker nodes belongs to the same cluster in each vpc.