Fixed typo in code, unnecessary data-role="fieldcontain" attribute. Fixes jquery-archive#2682. Thanks jarrettaylor

Author: toddparker

docs/forms/checkboxes/index.html

@@ -89,7 +89,7 @@ <h2>Horizontal toggle sets</h2>
 		<p>Checkboxes can also be used for grouped button sets where more than one button can be selected at once, such as the bold, italic and underline button group seen in word processors. To make a horizontal button set, add the <code> data-type="horizontal"</code> to the <code>fieldset</code>.</p>
 
 <code>
-&lt;fieldset data-role=&quot;controlgroup&quot; <strong>data-type=&quot;horizontal&quot;</strong> data-role=&quot;fieldcontain&quot;&gt;
+&lt;fieldset data-role=&quot;controlgroup&quot; <strong>data-type=&quot;horizontal&quot;</strong>&gt;
 </code>
 
 			<p>The framework will float the labels so they sit side-by-side on a line, hide the checkbox icons and only round the left and right edges of the group.</p>