Docs: Explain when to use RxDocument vs RxAttachment vs RxState vs Local Document

[nickchomey]

The docs for RxDocument, RxAttachment, RxState and localDocument all seem to be fine. But I'm having difficulty figuring out when I should use each.

Perhaps a Doc or Article could be written that gives a comparative overview, and walks through using each of them for different things in the same pseudo-app?

[stale]

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[nickchomey]

bump