Chat webhook moderation

[AndyTWF]

Description

• Add webhook moderation documentation.
• Fix the word "rule" being used in places.

CHA-1242

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)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch chat-webhook-moderation

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[AndyTWF]

@ably/team-deved This is ready for review, but have kept in draft until we're ready to merge.