[docs] [issue27589] asyncio doc: issue in as_completed() doc

[Guido van Rossum]

Guido van Rossum added the comment:

However, in general you should use a different pattern. Wrap each future in
a coroutine that does whatever you want to do to the first one ready and
maybe cancel the others. Then gather() all coroutines with the flag that
keeps errors.

--Guido (mobile)

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