chore: extract improvements from #21497 (backport #21506)

[mergify]

Description

ref #21497 (comment)

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Summary by CodeRabbit

• Documentation Updates

  • Enhanced clarity on module management and version upgrades in the Cosmos SDK.
  • Removed references to the GRPC-WEB embedded client; users are directed to use the Envoy proxy.
  • Updated migration paths and module requirements for better user guidance.
  • Clarified management of consensus parameters within the BaseApp documentation.

• New Features

  • Introduced the x/protocolpool module for handling community pool funds.

• Chores

  • Removed outdated comments and annotations to streamline documentation and code clarity.

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This is an automatic backport of pull request #21506 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 6ffa71a has failed:

On branch mergify/bp/release/v0.52.x/pr-21506
Your branch is up to date with 'origin/release/v0.52.x'.

You are currently cherry-picking commit 6ffa71abd.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   UPGRADING.md
	modified:   docs/learn/advanced/00-baseapp.md
	modified:   server/v2/cometbft/abci.go
	modified:   simapp/v2/app_config.go
	modified:   x/distribution/keeper/abci.go

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	deleted by us:   server/v2/types.go

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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