Incorrect comment of XLByteToSeg() and XLByteToPrevSeg()

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

Thanks for the patch. Looks good to me. I will commit/push into all
supported branches if there's no objection.

Best regards,
--
Tatsuo Ishii
SRA OSS, Inc. Japan
English: http://www.sraoss.co.jp/index_en.php
Japanese:http://www.sraoss.co.jp

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Thanks for the patch. Looks good to me. I will commit/push into all
supported branches if there's no objection.

Done.

Best regards,
--
Tatsuo Ishii
SRA OSS, Inc. Japan
English: http://www.sraoss.co.jp/index_en.php
Japanese:http://www.sraoss.co.jp

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On Tue, 01 Aug 2017 08:11:23 +0900 (JST)
Tatsuo Ishii <ishii@sraoss.co.jp> wrote:

Thanks for the patch. Looks good to me. I will commit/push into all
supported branches if there's no objection.

Done.

Thanks!

Best regards,
--
Tatsuo Ishii
SRA OSS, Inc. Japan
English: http://www.sraoss.co.jp/index_en.php
Japanese:http://www.sraoss.co.jp

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

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