Update index example in TOC footer

toc.ftr

@@ -6,8 +6,8 @@ on the same line as the name, the line number (or, in a few cases, numbers)
 where the name is defined.  Successive lines in an entry list the line
 numbers where the name is used.  For example, this entry:
 
-    swtch 2358
-        0317 2128 2166 2357 2358
+    swtch 2658
+        0374 2428 2466 2657 2658
 
-indicates that swtch is defined on line 2358 and is mentioned on five lines
-on sheets 03, 21, and 23.
+indicates that swtch is defined on line 2658 and is mentioned on five lines
+on sheets 03, 24, and 26.