Fix misspelled function name in comment.

Author: hlinnaka

src/backend/access/transam/xloginsert.c

@@ -443,7 +443,7 @@ XLogInsert(RmgrId rmid, uint8 info)
 		/*
 		 * Get values needed to decide whether to do full-page writes. Since
 		 * we don't yet have an insertion lock, these could change under us,
-		 * but XLogInsertRecData will recheck them once it has a lock.
+		 * but XLogInsertRecord will recheck them once it has a lock.
 		 */
 		GetFullPageWriteInfo(&RedoRecPtr, &doPageWrites);