## Description
ref: [discord comment](https://discord.com/channels/669268347736686612/669274997264613376/867829184248152084)
<!-- Add a description of the changes that this PR introduces and the files that
are the most critical to review. -->
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`.
---
### Author Checklist
*All items are required. Please add a note to the item if the item is not applicable and
please add links to any relevant follow up issues.*
I have...
- [ ] included the correct `docs:` prefix in the PR title
- [ ] targeted the correct branch (see [PR Targeting](https://github.com/cosmos/cosmos-sdk/blob/master/CONTRIBUTING.md#pr-targeting))
- [ ] provided a link to the relevant issue or specification
- [ ] followed the [documentation writing guidelines](https://github.com/cosmos/cosmos-sdk/blob/master/docs/DOC_WRITING_GUIDELINES.md)
- [ ] reviewed "Files changed" and left comments if necessary
- [ ] confirmed all CI checks have passed
### Reviewers Checklist
*All items are required. Please add a note if the item is not applicable and please add
your handle next to the items reviewed if you only reviewed selected items.*
I have...
- [ ] confirmed the correct `docs:` prefix in the PR title
- [ ] confirmed all author checklist items have been addressed
- [ ] confirmed that this PR only changes documentation
- [ ] reviewed content for consistency
- [ ] reviewed content for thoroughness
- [ ] reviewed content for spelling and grammar
- [ ] tested instructions (if applicable)
* 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>