Re: [whatwg/streams] Clarify that a pull source doesn't need to wait in pull() (#1014)

I didn't mean to discourage it, just to make clear that not returning a promise is an option. Maybe if I think about it a bit more I can come up with some concrete guidelines for when to do what.

I don't know how I feel about abortable `pull()` yet. I will have to give it more thought.

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