docs: add guidance for modifying messages during chat moderation

[splindsay-92]

Description

Guidance in chat moderation response for custom moderation was out-of-date. You can now provide a message field to change in place the original message before proceeding with the publish.

Checklist

• Commits have been rebased.
• Linting has been run against the changed file(s).
• The PR adheres to the writing style guide and contribution guide.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

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• Commit unit tests in branch chat/add-full-resp-handling-for-custom-chat-moderation

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