[DX-882] Improves idempotent publishing guidance

[umair-ably]

Description

Improves idempotent publishing guidance as per llm-eval docs audit

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 DX-882-indempotent

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[AndyTWF]

This feels like a weird comment to have here, someone reading this page probably isn't looking at Chat. If we want to talk about idempotency in Chat, should that not be happening on a Chat page? (Also Chat doesn't yet support REST idempotency)

[AndyTWF]

This example won't work if you're batch publishing (publish with array containing >1 message) as there's a special ID format for this