[AIT-280] Update JS LiveObjects documentation for apply-on-ACK

[lawrence-forooghian]

Description

This reflects the functionality implemented in ably/ably-js#2155, based on the DR and ably/specification#419. Written by Claude.

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 AIT-280-LiveObjects-apply-on-ACK

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[GregHolmes]

Only one comment, but not a breaker.

[GregHolmes]

Is this Aside needed? If the user is trying to implement with Swift or Java, they'll have the language relevant to them.

[lawrence-forooghian]

I was thinking that perhaps if they're using JS as their "main" SDK and then just porting their code across to Swift and Kotlin, then they might not re-read all the documentation for those two as well.