doc/codewalk: make it work with jQuery 1.8.2
    so that it could work with the bundled jQuery.

R=adg
CC=golang-dev
https://golang.org/cl/6592073
diff --git a/doc/codewalk/codewalk.js b/doc/codewalk/codewalk.js
index f780bc7..eb4667a 100644
--- a/doc/codewalk/codewalk.js
+++ b/doc/codewalk/codewalk.js
@@ -297,7 +297,7 @@
 };
 
 jQuery(document).ready(function() {
-  var viewer = new CodewalkViewer(jQuery());
+  var viewer = new CodewalkViewer(jQuery('#codewalk-main'));
   viewer.selectFirstComment();
   viewer.targetCommentLinksAtBlank();
   viewer.installEventHandlers();