Fixed typo in Twig template

templates/conference/show.html.twig

@@ -3,7 +3,7 @@
 {% block title %}Conference Guestbook - {{ conference }}{% endblock %}
 
 {% block body %}
-    <h2>{{ conference }} Conference<h2>
+    <h2>{{ conference }} Conference</h2>
 
     {% if comments|length > 0 %}
         <div>There are {{ comments|length }} comments.</div>