update accordion-group to panel

javascript.html

@@ -1738,7 +1738,7 @@ $('.collapse').collapse()
            <td>parent</td>
            <td>selector</td>
            <td>false</td>
-           <td>If selector then all collapsible elements under the specified parent will be closed when this collapsible item is shown. (similar to traditional accordion behavior - this dependent on the <code>accordion-group</code> class)</td>
+           <td>If selector then all collapsible elements under the specified parent will be closed when this collapsible item is shown. (similar to traditional accordion behavior - this dependent on the <code>panel</code> class)</td>
          </tr>
          <tr>
            <td>toggle</td>