Rewrite comment for shm_mq_receive_bytes.
The comment and the code diverged at some point before the initial commit of this feature, and I failed to notice. Noted by Tom Lane.
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@ -763,11 +763,12 @@ shm_mq_send_bytes(shm_mq_handle *mqh, Size nbytes, void *data, bool nowait,
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/*
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* Wait until at least *nbytesp bytes are available to be read from the
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* shared message queue, or until the buffer wraps around. On return,
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* *datap is set to the location at which data bytes can be read. The
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* return value is the number of bytes available to be read starting at
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* that offset; if the message has wrapped the buffer, it may be less than
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* bytes_needed.
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* shared message queue, or until the buffer wraps around. If the queue is
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* detached, returns SHM_MQ_DETACHED. If nowait is specified and a wait
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* would be required, returns SHM_MQ_WOULD_BLOCK. Otherwise, *datap is set
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* to the location at which data bytes can be read, *nbytesp is set to the
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* number of bytes which can be read at that address, and the return value
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* is SHM_MQ_SUCCESS.
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*/
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static shm_mq_result
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shm_mq_receive_bytes(shm_mq *mq, Size bytes_needed, bool nowait,
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