devguides: add proxy to wallet-rpc set_daemon

[plowsof]

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[0xFFFC0000]

Thanks @plowsof
If we add Syntax: <HOST:PORT> to the end of the doc, it would be much better IMHO.

[plowsof]

I was about to ask you for that, will add. Thanks!

[plowsof]

@0xFFFC0000 added syntax

[nahuhh]

Note: Need followup pr to change L145.

If the string is empty, mwr will resolve to localhost:RPC_DEFAULT_PORT (18081 for mainnet)

address - string; (Optional; Default: "localhost:RPC_DEFAULT_PORT") The URL of the daemon to connect to.

monero-project/monero#9211 (comment)