chore(docs): fix incorrect usage of 'a' and 'an' across documentation (backport #22976)

[mergify]

This PR addresses several grammatical issues related to the incorrect usage of the indefinite articles "a" and "an" across multiple documentation files. The changes improve clarity and readability by ensuring proper article usage before vowel and consonant sounds.

Closes:

N/A (Please replace with the relevant issue number if applicable)

Files Updated:

• docs/architecture/adr-045-check-delivertx-middlewares.md: Changed "An naive solution" to "A naive solution."
• docs/architecture/adr-75-v2.md: Changed "a overhead" to "an overhead."
• docs/rfc/rfc-006-handlers.md: Changed "a elevated" to "an elevated."
• docs/spec/store/README.md: Changed "a irrecoverable" to "an irrecoverable."
• docs/user/run-node/01-run-node.md: Changed "a unbounded" to "an unbounded."
• x/staking/CHANGELOG.md: Changed "a undelegation" to "an undelegation."

---

Author Checklist:

• Used the correct type prefix (chore) in the PR title.
• Targeted the correct branch as per contribution guidelines.
• Included a changelog entry to document changes.
• Confirmed that all CI checks have passed.

---

Reviewer Checklist:

• Verified the correct use of the type prefix in the PR title.
• Ensured all grammatical issues addressed in the listed files are resolved.
• Confirmed that the changelog entry is appropriately updated.

---

Additional Notes:

This PR includes small but important documentation fixes to maintain consistency and professionalism in project documentation. Let me know if further changes are required!

Summary by CodeRabbit

• New Features

  • Introduced pre and post message handlers for improved module development.
  • Enhanced modularity with the transition to Cosmos SDK version 2.
  • Added new metadata type in the staking module for validator details.

• Bug Fixes

  • Resolved issues preventing overslashing of unbonding delegations.
  • Fixed errors in the GetLastValidators function.

• Improvements

  • Updated error handling to return errors instead of logging.
  • Enhanced documentation for clarity and usability across various sections.

• API Breaking Changes

  • Significant alterations in method signatures and return types across multiple modules.

• State Breaking Changes

  • Removed certain keys from storage and updated initialization functions.

• Documentation

  • Updated various documents to improve clarity and provide additional guidance for users.

---

This is an automatic backport of pull request #22976 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 96cfd52 has failed:

On branch mergify/bp/release/v0.52.x/pr-22976
Your branch is up to date with 'origin/release/v0.52.x'.

You are currently cherry-picking commit 96cfd521d.
  (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:   docs/architecture/adr-045-check-delivertx-middlewares.md
	modified:   docs/rfc/rfc-006-handlers.md
	modified:   docs/spec/store/README.md
	modified:   docs/user/run-node/01-run-node.md
	modified:   x/staking/CHANGELOG.md

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	deleted by us:   docs/architecture/adr-75-v2.md

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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