Add new privacy.xml help file.

--HG--
extra : rebase_source : e141c5426e02dc38e38acb11fbf94ce4e5d62fc9

pentadactyl/locale/en-US/intro.xml

@@ -94,6 +94,10 @@
         <link topic="message">Error and informational messages</link>:
         A description of informational and error messages.
     </li>
+    <li>
+        <link topic="privacy">Privacy and sensitive information</link>:
+        How to manage your private data while browsing.
+    </li>
     <li>
         <link topic="developer">Developer information</link>:
         How to write plugins and documentation.