Docs: Fix grammar and clarify AccessManager migration

[Innaalek]

Fixed a small grammar issue in docs/modules/ROOT/pages/access-control.adoc for better readability.

PR Checklist

• Tests
• Documentation
• Changeset entry (run npx changeset add)

[changeset-bot]

⚠️ No Changeset found

Latest commit: f15b88f

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[coderabbitai]

Walkthrough

This PR updates the access-control documentation file with grammar refinements and clarifications. Changes include correcting singular/plural usage in descriptions of enumeration functions, fixing phrasing around contract integration complexity, and inserting migration notes that explain how msg.sender behavior changes when migrating to AccessManager—specifically, that restricted function calls will see msg.sender as the AccessManager contract via execute rather than the original caller.

Possibly related PRs

• #6016: Adds migration notes warning that restricted functions will see msg.sender as the AccessManager contract
• #5999: Applies wording and grammar fixes to the same access-control documentation
• #6006: Modifies the same documentation file with overlapping grammar and content edits

Suggested labels

documentation, ignore-changeset

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description check	✅ Passed	The description mentions fixing a grammar issue in the access-control documentation file and is directly related to the changeset, which includes grammar fixes and documentation notes about migration impact.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Title check	✅ Passed	The PR title accurately reflects the primary changes: grammar fixes and clarification of AccessManager migration behavior in the access-control documentation.

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✨ Finishing touches

• 📝 Generate docstrings

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