Add clipped flag to annotations doc

[vladvelici]

Description

Add the clipped and totalClientIds flags to annotations feature page. https://ably.atlassian.net/browse/CHA-1199

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.

[coderabbitai]

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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 clipped-message-annotations

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