attr: Removed unused class in markup.

Author: scottgonzalez

entries/attr.xml

@@ -29,7 +29,7 @@
       <p>The difference between <em>attributes</em> and <em>properties</em> can be important in specific situations. <strong>Before jQuery 1.6</strong>, the <code>.attr()</code> method sometimes took property values into account when retrieving some attributes, which could cause inconsistent behavior. <strong>As of jQuery 1.6</strong>, the <code>.prop()</code> method provides a way to explicitly retrieve property values, while <code>.attr()</code> retrieves attributes.</p>
       <p>For example, <code>selectedIndex</code>, <code>tagName</code>, <code>nodeName</code>, <code>nodeType</code>, <code>ownerDocument</code>, <code>defaultChecked</code>, and <code>defaultSelected</code> should be retrieved and set with the <code><a href="http://api.jquery.com/prop/">.prop()</a></code> method. Prior to jQuery 1.6, these properties were retrievable with the <code>.attr()</code> method, but this was not within the scope of <code>attr</code>. These do not have corresponding attributes and are only properties.</p>
       <p>Concerning boolean attributes, consider a DOM element defined by the HTML markup <code>&lt;input type="checkbox" checked="checked" /&gt;</code>, and assume it is in a JavaScript variable named <code>elem</code>:</p>
-      <table class="listing">
+      <table>
         <tr>
           <th>
             <code>elem.checked</code>