doc fix

src/views/overlaypanel/OverlayPanelDoc.vue

@@ -138,6 +138,14 @@ toggle(event) {
         <h5>Events</h5>
 		<div class="doc-tablewrapper">
 			<table class="doc-table">
+                <thead>
+                    <tr>
+                        <th>Name</th>
+                        <th>Parameters</th>
+                        <th>Description</th>
+                    </tr>
+				</thead>
+                <tbody>
                     <tr>
                         <td>show</td>
                         <td>-</td>
@@ -148,6 +156,7 @@ toggle(event) {
                         <td>-</td>
                         <td>Callback to invoke when the overlay is hidden.</td>
                     </tr>
+                </tbody>
             </table>
         </div>