📖 Document data types that are replicated

[nrb]

Summary

While we have this code structure in some controllers, it's useful to document for contributors.

[stevekuznetsov]

This looks good, but can we also document internal.kcp.io/replicate either in this PR or a follow-up? The GoDoc seems incorrect.

[nrb]

That's a great question - it appears to only be relevant for LogicalClusters, ClusterRoles, and ClusterRoleBindings

@davidfestal is the internal.kcp.io/replicate annotation only used for filtering these three types, or is its use more broad?

[davidfestal]

I think that for now it's mostly for these 3
cc @sttts

[nrb]

IMO we can add the annotation later. Sounds like the team's not super clear on it either.

[stevekuznetsov]

/lgtm
/approve

[openshift-ci]

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