add multiple triggers info to popover docs

docs/_includes/js/popovers.html

@@ -218,7 +218,7 @@ $('.popover-dismiss').popover({
           <td>trigger</td>
           <td>string</td>
           <td>'click'</td>
-          <td>How popover is triggered - click | hover | focus | manual</td>
+          <td>How popover is triggered - click | hover | focus | manual. You may pass multiple triggers; separate them with a space.</td>
         </tr>
         <tr>
          <td>viewport</td>