docs: update transformer documentation to include async transforms

[benmccann]

Summary

Update transformer documentation to include async transforms, which were added in #11191. This feature was released in Jest 27, but it looks like the docs weren't updated

Test plan

N/A

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[benmccann]

I have signed the CLA

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[SimenB]

thanks! could you update https://github.com/facebook/jest/blob/master/website/versioned_docs/version-27.0/CodeTransformation.md as well?

[benmccann]

ok. I've updated the versioned docs as well

[SimenB]

Thanks!

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