Document get_connections and remaining shared RPC methods

[mariano54]

[danieljperry]

A lot of this work has been done external to Chia. It's a matter of integrating this work into docs.chia.net. Here's the repo: https://github.com/dkackman/chia-api

Specifically for get_connections: https://dkackman.github.io/chia-api/static/fullnode.html#api-Connections-getConnections

[BrandtH22]

protocols all have the necessary links from #559 , detailed information will not be documented on these per request from product