jQuery.widget: Remove extraneous spaces in :data selectors

Spaces within :data selectors are significant, and the ones used in these docs
were causing the examples to not find the correct elements.

Closes gh-285

(cherry picked from commit 1df2c5f)

Author: tjvantoll

entries/jQuery.widget.xml

@@ -118,14 +118,14 @@
 			<p>Whether an element has a given widget bound to it can be determined using the <a href="/data-selector/"><code>:data</code></a> selector.</p>
 
 			<pre><code>
-				$( "#elem" ).is( ":data( 'ui-progressbar' )" ); // true
-				$( "#elem" ).is( ":data( 'ui-draggable' )" ); // false
+				$( "#elem" ).is( ":data('ui-progressbar')" ); // true
+				$( "#elem" ).is( ":data('ui-draggable')" ); // false
 			</code></pre>
 
 			<p>You can also use <code>:data</code> to get a list of all elements that are instances of a given widget.</p>
 
 			<pre><code>
-				$( ":data( 'ui-progressbar' )" );
+				$( ":data('ui-progressbar')" );
 			</code></pre>
 
 			<h3>Properties</h3>