Update demo

Author: rbrtsmith

demo/index.html

@@ -478,7 +478,7 @@ <h2>Flag</h2>
       <li>An image</li>
       <li>A button</li>
       <li>A video</li>
-      <li>Anything that takes up abitrary space</li>
+      <li>Anything that takes up a fixed amount of space</li>
     </ul>
 
     <h3>Component left</h3>