Re: [whatwg/streams] "it can return a promise" -> actually a thenable (#566)

I think it is fine as-is. The notes explaining usage are meant to guide you down the right path, not state what is technically allowed.

As a separate example, we would say "can return a number" instead of "can return any object that coerces to a number". (I.e., there's no need to point out that not only `1`, but also `{ valueOf() { return 1; } }` or `"1"` work.)

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