Fix crash in d-figure

examples/article.html

@@ -23,7 +23,7 @@
 <d-article>
   <d-title>
     <h1>Attention and Augmented Recurrent Neural Networks</h1>
-    <!-- <h2>Some people want a deck</h2> -->
+    <h2>Some people want a deck</h2>
     <d-byline></d-byline>
   </d-title>
   <d-abstract>