Use recommended async-await in examples

[piranna]

Summary

Test plan

[mrazauskas]

Take a look here:

https://github.com/facebook/jest/blob/c97467c88a313054c2dbe189db8fff3cce9122f9/website/versioned_docs/version-29.5/TestingAsyncCode.md?plain=1#L42-L52

And check #12555 as well.

Seems like the order of sections got messed up in the mention PR. Would be good to fix that.

EDIT: I mean, ".resolves / .rejects" section should be simply moved after "Promises" section where it was before.

[github-actions]

This PR is stale because it has been open 90 days with no activity. Remove stale label or comment or this will be closed in 30 days.

[piranna]

Can we get this merged? What's missing?

[mrazauskas]

Looks like you missed my comment above. Or? (;

[github-actions]

This PR is stale because it has been open 90 days with no activity. Remove stale label or comment or this will be closed in 30 days.

[github-actions]

This PR was closed because it has been stalled for 30 days with no activity. Please open a new PR if the issue is still relevant, linking to this one.

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