[HACKERS] Incorrect comment of XLByteToSeg() and XLByteToPrevSeg()

Hi,

I found a type in the comment for XLByteToSeg() and XLByteToPrevSeg().
This says "Compute ID and segment from an XLogRecPtr", but these
macros compute only segment numbers. I think "Compute a segment number
from an XLogRecPtr" is correct.

The definition of these macros were modified by the following commit,
but the comment were not.

commit dfda6ebaec6763090fb78b458a979b558c50b39b
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date:   Sun Jun 24 18:06:38 2012 +0300

Regards,

-- 
Yugo Nagata <nagata@sraoss.co.jp>

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