docs: update cloudflare worker docs

[leedavidcs]

✅ Checklist

• [x] I have followed every step in the contributing guide (updated 2023-01-05).
• [x] The PR title follows the conventional-commit convention.
• [ ] I have added or updated the tests related to the changes made.

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Changelog

Update docs for Cloudflare Workers on supporting WebSocket hibernation.

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