Fix copy/paste-o

examples/layout-helpers.html

@@ -123,7 +123,7 @@
 
 				<section id="vstack">
 					<h2>VStack</h2>
-					<p>Stacks multiple elements horizontally.</p>
+					<p>Stacks multiple elements vertically.</p>
 					<pre><code class="html" data-trim data-line-numbers>
 					  <div class="r-vstack">
 					    &lt;img width="450" height="300" src="..."&gt;