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Fix #970, update documentation for read/write #972

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Commits on Apr 27, 2021

  1. Fix nasa#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.
    jphickey committed Apr 27, 2021
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