pgsql: Fix comment.

Fix comment.

XLByteToSeg and XLByteToPrevSeg calculate only a segment number. The
definition of these macros were modified by commit
dfda6ebaec6763090fb78b458a979b558c50b39b but the comment remain
unchanged.

Patch by Yugo Nagata. Back patched to 9.3 and beyond.

Branch
------
REL9_5_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/ca99f5b5fd90828f150714021f517de46a47dfe6

Modified Files
--------------
src/include/access/xlog_internal.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

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