docs: add async

[tyankatsu0105]

Issue: #

What Changed

Checklist

Check the ones applicable to your change:

• [ ] Ran yarn update-all
• [ ] Tests are updated
• [x] Documentation is updated

Change Type

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• [ ] maintenance
• [x] documentation
• [ ] patch
• [ ] minor
• [ ] major

[github-actions[bot]]

:rocket: PR was released in v0.6.12 :rocket: