Update obsolete comments.

We no longer have a TLI field in the page header.

src/backend/access/heap/heapam.c

@@ -6974,8 +6974,8 @@ log_newpage(RelFileNode *rnode, ForkNumber forkNum, BlockNumber blkno,
 	recptr = XLogInsert(RM_HEAP_ID, XLOG_HEAP_NEWPAGE, rdata);
 
 	/*
-	 * The page may be uninitialized. If so, we can't set the LSN and TLI
-	 * because that would corrupt the page.
+	 * The page may be uninitialized. If so, we can't set the LSN because
+	 * that would corrupt the page.
 	 */
 	if (!PageIsNew(page))
 	{

src/backend/access/nbtree/nbtinsert.c

@@ -996,9 +996,9 @@ _bt_split(Relation rel, Buffer buf, Buffer cbuf, OffsetNumber firstright,
 	/* rightpage was already initialized by _bt_getbuf */
 
 	/*
-	 * Copy the original page's LSN and TLI into leftpage, which will become
-	 * the updated version of the page.  We need this because XLogInsert will
-	 * examine these fields and possibly dump them in a page image.
+	 * Copy the original page's LSN into leftpage, which will become the
+	 * updated version of the page.  We need this because XLogInsert will
+	 * examine the LSN and possibly dump it in a page image.
 	 */
 	PageSetLSN(leftpage, PageGetLSN(origpage));