docs(no-async-in-computed-properties): suggest computedAsync instead of vue-async-computed

[ShayanTheNerd]

I accidentally stumbled upon the documentation page for no-async-in-computed-properties rule, and noticed that it suggests using vue-async-computed package in case we need async code in computed. This package hasn't been maintained for over 2 years, so I believe computedAsync from VueUse is a much better, well-maintained alternative. Besides, there's a good chance that developers already use some other composable from VueUse, which means they won't need to install yet another random NPM package to solve a simple issue.

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[FloEdelmann]

Sounds good to me, thank you 🙂