Types: Add entry for QUnit's Assert type

Ref qunitjs/api.qunitjs.com#58

pages/Types.html

@@ -639,3 +639,5 @@ <h2 id="Callbacks">Callbacks Object</h2>
 <p>A multi-purpose object that provides a powerful way to manage callback lists. It supports adding, removing, firing, and disabling callbacks. The Callbacks object is created and returned by the <code>$.Callbacks</code> function and subsequently returned by most of that function's methods. </p>
 <h2 id="XMLDocument">XML Document</h2>
 <p>A document object created by the browser's XML DOM parser, usually from a string representing XML. XML documents have different semantics than HTML documents, but most of the traversing and manipulation methods provided by jQuery will work with them.</p>
+<h2 id="Assert">Assert</h2>
+<p>A reference or instance of the object holding all of QUnit's assertions. See the <a href="//api.qunitjs.com/QUnit.assert">API documentation for <code>QUnit.assert</code></a> for details.</p>