Improve layout docs

docs/documentation/layout/footer.html

@@ -22,6 +22,12 @@ breadcrumb:
 </footer>
 {% endcapture %}
 
+<div class="content">
+  <p>
+    The Bulma <strong>footer</strong> is a simple container, with lots of bottom padding, making it great as the last element of any webpage.
+  </p>
+</div>
+
 {% include elements/snippet.html content=footer_example horizontal=true more=true %}
 
 {% include elements/variables.html %}