docs: fixed typos and improved clarity in documentation (partial backport #23077)

[mergify]

corrected typos:
u32 is an uint32 - u32 is a uint32
feeGrater - feeGranter
Appmanager - App Manager
english - English

Summary by CodeRabbit

• Bug Fixes
  • Corrected article usage in comment for u32 field in MsgRequest.
  • Fixed typo in variable name from feeGrater to feeGranter in txParamsFromFlagSet function.
  • Updated comment formatting for "Appmanager" to "App Manager" in documentation.
  • Corrected capitalization of "english" to "English" in comment for Language type.

---

This is an automatic backport of pull request #23077 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of ef7dbc9 has failed:

On branch mergify/bp/release/v0.52.x/pr-23077
Your branch is up to date with 'origin/release/v0.52.x'.

You are currently cherry-picking commit ef7dbc9ab.
  (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:   client/grpc/reflection/reflection.pb.go
	modified:   client/v2/internal/testpb/msg.proto
	modified:   client/v2/tx/types.go
	modified:   crypto/keyring/types.go

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