update docs for placement

docs/javascript.html

@@ -635,7 +635,7 @@ $('a[data-toggle="tab"]').on('shown', function (e) {
                <td>placement</td>
                <td>string</td>
                <td>'right'</td>
-               <td>how to position the popover - above | below | left | right</td>
+               <td>how to position the popover - top | bottom | left | right</td>
              </tr>
              <tr>
                <td>selector</td>