Make <toc/> tag explicit.

common/locale/en-US/browsing.xml

@@ -9,6 +9,7 @@
     xmlns="http://vimperator.org/namespaces/liberator"
     xmlns:html="http://www.w3.org/1999/xhtml">
 <h1 tag="surfing browsing">Browsing</h1>
+<toc start="2"/>
 
 &liberator.appname; overrides nearly all &liberator.host; keys in order to make browsing more
 pleasant for Vim users. On the rare occasions when you want to pass a keystroke