title: Subtitle or child element in Antd Menu.Item
body: <p>I see that you can <a href="https://stackoverflow.com/questions/59987190/antd-word-wrap-in-menu-item">wrap words</a> in an <a href="https://ant.design/components/menu/" rel="nofollow noreferrer">Antd Menu.Item</a> but I'm wondering if you can create a (styled) child element or subtitle for a menu item. something like:</p>
  <pre><code>------
  **Item 1**
  ---
  **Item 2**
  This item is second
  ---
  **Item 3**
  ------
  </code></pre>
  <p>I've tried adding a <code>&lt;div&gt;</code> or a <code>&lt;p&gt;</code> like the following but it just seems like it's hidden.</p>
  <pre><code>&lt;Menu.Item key={eventKey} {...props}
      &lt;span&gt;{item.title}&lt;/span&gt;
      &lt;div&gt;A styled subtitle here&lt;/div&gt;
  &lt;/Menu.Item&gt;
  </code></pre>