1. - [ ] Mandatory: Add the required version to the Fix version/s field.

ACM 2.15

goal is to make existing documentation more clear and more easy to find!

What we document is a prerequisite for Fine-Grained-RBAC to work
in a Hub-Spoke scenario

difficult to find and to understand:
https://docs.redhat.com/en/documentation/red_hat_advanced_cluster_management_for_kubernetes/2.14/html-single/clusters/index#access-managed-cluster-kube-apiserver

and:
https://github.com/stolostron/cluster-proxy-addon/blob/main/pkg/serviceproxy/readme.md#1-the-pre-req-of-using-service-proxy-impersonation-feature

previous jira:

https://issues.redhat.com/browse/ACM-20220

2. - [ ] Mandatory: Choose the type of documentation change or review.

not 100% clear

• [x ] We need to update to an existing topic

3. - [ ] Mandatory: Find the link to where the documentation update
should go and add it to the recommended changes. You can either use the
published doc or the staged repo for this step:

Note: As the feature and doc is understood, this recommendation may
change. If this is new documentation, link to the section where you think
it should be placed.

Customer Portal published version

https://docs.redhat.com/en/documentation/red_hat_advanced_cluster_management_for_kubernetes/2.14

Doc staged repo within the ACM Workspace:
https://github.com/stolostron/rhacm-docs