Collapsible: Added option corners to option page and data- attribute reference.

Author: jaspermdegroot

docs/api/data-attributes.html

@@ -105,6 +105,10 @@ <h2><a href="../content/content-collapsible.html">Collapsible</a></h2>
 					<th>data-content-theme</th>
 					<td>swatch letter (a-z)</td>
 				</tr>
+				<tr>
+					<th>data-corners</th>
+					<td><strong>true</strong> | false</td>
+				</tr>
 				<tr>
 					<th>data-expanded-icon</th>
 					<td>home | delete | plus | arrow-u | arrow-d | check | gear | grid | star | custom | arrow-r | arrow-l | <strong>minus</strong> | refresh | forward | back | alert | info | search</td>

docs/content/content-collapsible-options.html

@@ -79,6 +79,17 @@ <h2>Collapsible content</h2>
 				<p>This option is also exposed as a data attribute: <code>data-content-theme=&quot;a&quot;</code>.</p>
 			</dd>
 
+			<dt><code>corners</code> <em>boolean</em></dt>
+			<dd>
+				<p class="default">default: true</p>
+				<p>Applies the theme border-radius if set to true. To set the value for all instances of this widget, bind this option to the <a href="../../api/globalconfig.html">mobileinit event</a>:</p>
+<pre><code>$( document ).bind( "mobileinit", function(){
+    <strong>$.mobile.collapsible.prototype.options.corners = false;</strong>
+});
+</code></pre>
+				<p>This option is also exposed as a data attribute: <code>data-corners=&quot;false&quot;</code>.</p>
+			</dd>
+
 			<dt><code>expandCueText</code> <em>string</em></dt>
 			<dd>
 				<p class="default">default: " click to expand contents"</p>