docs(meshservice): modify targetref

[slonka]

I'm struggling a bit, maybe @michaelbeaumont can tell me what else needs to be changed and how he envisioned this.

Should I go through every policy and change MeshService to be compatible with the new form (basically adding namespace and modifying the name - or should I always use labels?)? Or should I add deprecation notice and an example showing the new way?

I started changing federation guide but waiting for some feedback first.

closes #1892

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