Add section to Async.md discussing readiness/non-blocking I/O #565
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alexcrichton
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lann
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Update preexisting documentation with WebAssembly/component-model#565 and also reformat `poll_produce` docs to have sections and be a bit less than a wall-of-text.
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Update preexisting documentation with WebAssembly/component-model#565 and also reformat `poll_produce` docs to have sections and be a bit less than a wall-of-text.
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This PR adds some explanatory prose in a new section in Async.md to discuss zero-length reads/writes and capture some of the discussion in #561 and #441.