Merge pull request #9851 from liuyl/typo

fix typo

components.html

@@ -248,7 +248,7 @@ base_url: "../"
 {% highlight html %}
 <button type="button" class="btn btn-default btn-lg">
   <span class="glyphicon glyphicon-star"></span> Star
-</a>
+</button>
 {% endhighlight %}
 
   </div>