Doc sidebar: point to 3.4 as dev.

Doc/tools/sphinxext/indexsidebar.html

@@ -2,9 +2,8 @@
             <p><a href="{{ pathto('download') }}">Download these documents</a></p>
 	    <h3>Docs for other versions</h3>
 	    <ul>
-	      <li><a href="http://docs.python.org/2.6/">Python 2.6 (stable)</a></li>
-	      <li><a href="http://docs.python.org/3.2/">Python 3.2 (stable)</a></li>
-	      <li><a href="http://docs.python.org/dev/">Python 3.3 (in development)</a></li>
+	      <li><a href="http://docs.python.org/3.3/">Python 3.3 (stable)</a></li>
+	      <li><a href="http://docs.python.org/3.4/">Python 3.4 (in development)</a></li>
               <li><a href="http://www.python.org/doc/versions/">Old versions</a></li>
             </ul>