Improve components documentation

docs/documentation/components/menu.html

@@ -51,6 +51,23 @@ meta:
 </aside>
 {% endcapture %}
 
+<div class="content">
+  <p>
+    The Bulma <code>menu</code> is a vertical navigation component that comprises:
+  </p>
+  <ul>
+    <li>
+      the <code>menu</code> container
+    </li>
+    <li>
+      informative <code>menu-label</code> labels
+    </li>
+    <li>
+      interactive <code>menu-list</code> lists that can be nested up to 2 levels
+    </li>
+  </ul>
+</div>
+
 {% include elements/snippet.html content=menu_example size="one-third" %}
 
 {% include elements/variables.html type='component' %}