[bitcoin/bitcoin] Add PSBT documentation (#13941)

sipa commented on this pull request.

> +- **`finalizepsbt` (Finalizer, Extractor)** is a utility RPC that finalizes any
+ partial signatures, and if all inputs are finalized, converts the result to a
+ fully signed transaction which can be broadcast with `sendrawtransaction`.
+- **`combinepsbt` (Combiner)** is a utility RPC that implements a Combiner. It
+ can be used at any point in the workflow to merge information added to
+ different versions of the same PSBT. In particular it is useful to combine the
+ output of multiple Updaters or Signers.
+- **`decodepsbt`** is a diagnostic utility RPC which will show all information in
+ a PSBT in human-readable form, as well as compute its eventual fee if known.
+### Workflows
+#### Multisig with multiple Bitcoin Core instances
+Alice, Bob, and Carol want to create a 2-of-3 multisig address. They’re all using
+Bitcoin Core.

Done, added a note about having separate walets.

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