Fix docs: level-element can also have horizontal layout on mobile

docs/documentation/overview/responsiveness.html

@@ -35,7 +35,7 @@ $fullhd-enabled: false
     <li>the <code>level</code> component will show its children stacked vertically</li>
     <li>the <code>nav</code> menu will be hidden</li>
   </ul>
-  <p>You can however enforce the <strong>horizontal</strong> layout for both <code>columns</code> or <code>nav</code> by appending the <code>is-mobile</code> modifier.</p>
+  <p>You can however enforce the <strong>horizontal</strong> layout for both <code>columns</code> or <code>level</code> by appending the <code>is-mobile</code> modifier.</p>
 </div>
 
 {% include elements/anchor.html name="Breakpoints" %}