add note about backdrop static

docs/javascript.html

@@ -276,7 +276,7 @@
                <td>backdrop</td>
                <td>boolean</td>
                <td>true</td>
-               <td>Includes a modal-backdrop element</td>
+               <td>Includes a modal-backdrop element. Alternatively, specify <code>static</code> for a backdrop which doesn't close the modal on click.</td>
              </tr>
              <tr>
                <td>keyboard</td>

docs/templates/pages/javascript.mustache

@@ -200,7 +200,7 @@
                <td>{{_i}}backdrop{{/i}}</td>
                <td>{{_i}}boolean{{/i}}</td>
                <td>{{_i}}true{{/i}}</td>
-               <td>{{_i}}Includes a modal-backdrop element{{/i}}</td>
+               <td>{{_i}}Includes a modal-backdrop element. Alternatively, specify <code>static</code> for a backdrop which doesn't close the modal on click.{{/i}}</td>
              </tr>
              <tr>
                <td>{{_i}}keyboard{{/i}}</td>