Sort doc comments newest first

Author: Daniel15

site/jekyll/_layouts/docs.html

@@ -12,6 +12,6 @@ <h1>{{ page.title }}</h1>
     {{ content }}
 
     <h2>Comments</h2>
-    <div class="fb-comments" data-width="650" data-num-posts="10" data-href="http://reactjs.net{{ page.url }}"></div>
+    <div class="fb-comments" data-width="650" data-num-posts="10" data-href="http://reactjs.net{{ page.url }}" data-order-by="reverse_time"></div>
   </div>
 </section>