io: clarify the zero capacity case of AsyncRead::poll_read
#7580
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5b9a290 improved the trait documentation for the cases when the buf length didn't change but forgot to do the same for the method documentation. Signed-off-by: Martin Tzvetanov Grigorov <mgrigorov@apache.org>
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AsyncRead::poll_read
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Motivation
5b9a290 improved the trait documentation for the cases when the buf length didn't change but forgot to do the same for the method documentation.
Solution
Apply the improvement also for the method documentation.