Fix beta page

I thought I had tested this, but clearly not.

Author: jkatz

templates/pages/developer/beta.html

@@ -66,5 +66,4 @@ <h1>Beta Information <i class="fa fa-code"></i></h1>
     <a href="https://wiki.postgresql.org/wiki/HowToBetaTest" target="_blank" rel="noopener">A Guide to PostgreSQL Beta Testing</a>
   </li>
 </ul>
-{% endcomment %}
 {%endblock%}