Removed createBlockingRoot API docs and added a warning note

[bvaughn]

Follow up to facebook/react#21316

[eps1lon]

Want to remove timeoutMS as well while you're at it (facebook/react#19703)? 😄

[bvaughn]

Nope 😆 Sorry this was just a quick bandaid fix

[eps1lon]

Nope Sorry this was just a quick bandaid fix

Ok, I just looked for every mention of timeoutMS and it does look a bit more involved. I don't know enough about the current semantics to update sections such as

If we make our API responses take 5 seconds, we can confirm that now React "gives up" and transitions anyway to the next screen after 3 seconds. This is because we passed {timeoutMs: 3000} to useTransition(). For example, if we passed {timeoutMs: 60000} instead, it would wait a whole minute.

[gaearon]

The plan is to nix these docs before the release in favor of much more focused ones so I wouldn’t worry about updating them.

[gaearon]

Seems fine but a lot of other things are outdated too so I don’t know that this one needs special treatment

[bvaughn]

True! I only proposed this because it seemed to cause confusion but I don't feel strongly one way or another.

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