Add Suspense docs

[fxxjdedd]

I think it needs a separate section to doc Suspense

[NataliaTepluhina]

@fxxjdedd Suspense is still experimental feature so we won't take this as a first priority but let's keep issue open to track what we're missing 👍🏻

[fadamakis]

There are some references on suspense that should either be completed or removed
https://v3.vuejs.org/guide/component-dynamic-async.html#using-with-suspense

[softboy99]

+1

[softboy99]

Hi,
i just want to use aync setup. after google, it said,it should be used with suspense together. However, currently, there is little documentation about suspense. please update docs about how to use suspense. i find the following:
vuejs/core#2099
but, it too little

[skirtles-code]

An introduction to the core features of Suspense can now be found here:

https://v3.vuejs.org/guide/migration/suspense.html

It is still considered experimental, so it won't be added to the main guide or API reference for now. Advanced use cases, such as SSR, will also need documenting.

[LinusBorg]

I'd suggest that we close this issue for now. Documentating this experimental feature in the mirgsation guide is enough until it has stabelized, in my opinion.

Thoughts?

[skirtles-code]

Closing. We can revisit this once Suspense is stable.