Fix comment.

tatsuo-ishii · tatsuo-ishii · commit bd8ff3876008 · 2017-08-01T08:08:32.000+09:00
XLByteToSeg and XLByteToPrevSeg calculate only a segment number. The definition of these macros were modified by commit dfda6eb but the comment remain unchanged. Patch by Yugo Nagata. Back patched to 9.3 and beyond.
diff --git a/src/include/access/xlog_internal.h b/src/include/access/xlog_internal.h
@@ -96,7 +96,7 @@ typedef XLogLongPageHeaderData *XLogLongPageHeader;
 		(dest) = (segno) * XLOG_SEG_SIZE + (offset)
 
 /*
- * Compute ID and segment from an XLogRecPtr.
+ * Compute a segment number from an XLogRecPtr.
  *
  * For XLByteToSeg, do the computation at face value.  For XLByteToPrevSeg,
  * a boundary byte is taken to be in the previous segment.  This is suitable

Original file line number	Diff line number	Diff line change
`@@ -96,7 +96,7 @@ typedef XLogLongPageHeaderData *XLogLongPageHeader;`
`96`	`96`	`(dest) = (segno) * XLOG_SEG_SIZE + (offset)`
`97`	`97`
`98`	`98`	`/*`
`99`		`- * Compute ID and segment from an XLogRecPtr.`
	`99`	`+ * Compute a segment number from an XLogRecPtr.`
`100`	`100`	`*`
`101`	`101`	`* For XLByteToSeg, do the computation at face value. For XLByteToPrevSeg,`
`102`	`102`	`* a boundary byte is taken to be in the previous segment. This is suitable`