[Docs] Helpers needed a readjustment

There was a TR without an opening tag + the last TH hadn't the correct rowspan

docs/documentation/modifiers/helpers.html

@@ -35,10 +35,11 @@ breadcrumb:
       <td>Removes any <strong>padding</strong></td>
     </tr>
     <tr>
-      <th rowspan="6">Other</th>
+      <th rowspan="7">Other</th>
       <td><code>is-overlay</code></td>
       <td>Completely covers the first positioned parent</td>
     </tr>
+    <tr>
       <td><code>is-clipped</code></td>
       <td>Adds overflow <strong>hidden</strong></td>
     </tr>