title: How do I add a title to my menu group
body: <p>I want to differentiate the groups by giving them a title or divider, but I can't find a title option for the group element.</p>
  
  <p>Is there a way to add a title or divider?</p>
  
  <pre><code>&lt;group android:id="@+id/menu_group_sort" &gt;
          &lt;item
              android:id="@+id/menu_sort_relevance"
              android:showAsAction="never"
              android:title="@string/sort_relevance"/&gt;
          &lt;item
              android:id="@+id/menu_sort_rating"
              android:showAsAction="never"
              android:title="@string/sort_rating"/&gt;
  
      &lt;/group&gt;
  </code></pre>