update default 'template' value in popover docs

docs/_includes/js/popovers.html

@@ -199,7 +199,7 @@ $('.popover-dismiss').popover({
         <tr>
           <td>template</td>
           <td>string</td>
-          <td><code>'&lt;div class="popover"&gt;&lt;div class="arrow"&gt;&lt;/div&gt;&lt;h3 class="popover-title"&gt;&lt;/h3&gt;&lt;div class="popover-content"&gt;&lt;/div&gt;&lt;/div&gt;'</code></td>
+          <td><code>'&lt;div class="popover" role="tooltip"&gt;&lt;div class="arrow"&gt;&lt;/div&gt;&lt;h3 class="popover-title"&gt;&lt;/h3&gt;&lt;div class="popover-content"&gt;&lt;/div&gt;&lt;/div&gt;'</code></td>
           <td>
            <p>Base HTML to use when creating the popover.</p>
            <p>The popover's <code>title</code> will be injected into the <code>.popover-title</code>.</p>