Fix the docs for the RBAC examples, and add "get" permission on peering

[nolar]

Issue : #12, #49

The docs were missing the cluster-vs-namespaced object separation.

And there were no "GET" permission on the peering object by its name. Now, it is added to address our incident (see #49 background).

These docs will be later affected by #36.

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• ✅ Approved by PR author @nolar
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