Note that Types page is not a comprehensive guide

Fixes gh-832
Closes gh-850

Author: AurelioDeRosa

pages/Types.html

@@ -9,7 +9,7 @@
 ol ul li { font-size: 1em !important; }
 ol ul { margin-left: 1.5em !important; }
 </style>
-<p>JavaScript provides several built-in datatypes. In addition to those, this page documents virtual types like Selectors, enhanced pseudo-types like Events and all and everything you wanted to know about Functions.
+<p>JavaScript provides several built-in datatypes. In addition to those, this page documents virtual types like Selectors, enhanced pseudo-types like Events and some concepts you need to know about Functions. If you want to study these concepts in depth, take a look at <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript">MDN</a>.
 </p>
 <p>You should be able to try out most of the examples below by just copying them to your browser's JavaScript Console (Chrome, Safari with Develop menu activated, IE 8+) or <a href="http://www.getfirebug.com/">Firebug</a> console (<a href="https://www.mozilla.org/en-US/firefox/new/">Firefox</a>).
 </p>