Add trademark stuff to homepage

doc/index.html

@@ -215,6 +215,10 @@ server.listen(1337, "127.0.0.1");
 
     <div style="clear: both; font-size: 8pt">
       Copyright 2010 Joyent, Inc
+      <br/>
+      Node.js is a trademark of Joyent, Inc.
+      See the <a href="trademark-policy.pdf">trademark policy</a>
+      for more information.
     </div>
 
     <script type="text/javascript">