docs(configuration-file): document async function

[nicojs]

See #3660

[devoto13]

There is already a PR in flight to document async config. I'm not sure whether it is best to present an example with old-school promise, async function, or both. I'm leaning towards the async function example as more modern and readable. So I think we can rebase it once the other PR is merged as it provides more info about the feature.

[nicojs]

I didn't see that PR, sorry about that.

JS Devs in 2022 know what an async function is and what a Promise is. Adding this small example should be enough IMHO.

[devoto13]

Yeah, maybe you're right and we don't need to provide so many details about the async config.

@jginsburgn Are you fine merging this instead of #3733?

[karmarunnerbot]

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