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Fix #970, update documentation for read/write
Update the API documentation for OS_read/write/TimedRead/TimedWrite. Clarify that zero will be returned on EOF condition, and in the case of the timed API calls, the OS_ERR_TIMEOUT status code will be returned if the timeout expired without the handle becoming readable/writable during that time. This is intended to allow the caller to differentiate between a handle which is in a state where it cannot read/write data (e.g. at EOF, or a pipe/socket with remote end closed) and handle which is simply idle or busy.
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