Document for Multi-Cluster Federation on ROSA environment

QE Deployed the Federation environment on ROSA Multi-Cluster. It deployed as expected.

https://docs.openshift.com/container-platform/4.10/service_mesh/v2x/servicemesh-release-notes.html#service-mesh-federation,

Remove this line: Service Mesh Federation is not supported between clusters on Red Hat OpenShift Service on AWS (ROSA), Azure Red Hat OpenShift (ARO), or OpenShift Dedicated (OSD).  (leave this line in the 2.1 RN, ROSA wasn't tested/supported when we released 2.1)

Service Mesh Federation is supported between clusters on Red Hat OpenShift Service on AWS (ROSA)

Note: ROSA supports Multi-Cluster and Single Cluster of Service Mesh Federation.

***

Files to be updated:

modules/ossm-rn-new-features.adoc - OSSM 2.2 Adds support for Red Hat OpenShift Service on AWS (ROSA) and federation on ROSA.  [DONE in Release Notes PR]

modules/ossm-supported-configurations.adoc - Add Red Hat OpenShift Service on AWS (ROSA) to the list of supported platforms

(Also update the bullet "Azure Red Hat OpenShift (ARO) version 4")

modules/ossm-federation-limitations.adoc - Remove third bullet "Federation of meshes is not supported on Red Hat OpenShift Service on AWS (ROSA)."