## Description
ref: [discord comment](https://discord.com/channels/669268347736686612/669274997264613376/867829184248152084)
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This pull request provides clarification on the services that can be registered with the gRPC server and an example for broadcasting a transaction using `grpcurl`.
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* doc: Updates related to ServiceMsg, sdk.Msg and Msg service
* Apply suggestions from code review
Co-authored-by: Ryan Christoffersen <12519942+ryanchrypto@users.noreply.github.com>
* remove one more ServiceMsg
* Use service method rathr than service RPC
Co-authored-by: Ryan Christoffersen <12519942+ryanchrypto@users.noreply.github.com>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>
Brenn Hill
Ryan Christoffersen
Robert Zaremba
Pash
Amaury
Marko
Amaury
MD Aleem