docs: update cometbft db code reference link (backport #22166)

[mergify]

Description

Since prefix_db.go has been removed from cometbft to cometbft-db at this commit, the original link couldn't work now,we should update them

Summary by CodeRabbit

• Documentation

  • Updated comments to reflect new URLs for the Iterator and ReverseIterator methods in the Store and prefixstore packages, ensuring accurate references to the cometbft-db repository.

• Bug Fixes

  • No functional changes were made; all existing methods continue to operate as intended without any alterations to their logic or signatures.

---

This is an automatic backport of pull request #22166 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 8117f2c has failed:

On branch mergify/bp/release/v0.52.x/pr-22166
Your branch is up to date with 'origin/release/v0.52.x'.

You are currently cherry-picking commit 8117f2c50.
  (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:   x/accounts/internal/prefixstore/prefixstore.go
	modified:   x/group/internal/orm/prefixstore/prefixstore.go

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