fix accessibility warnings

opentech/apply/funds/templates/funds/revisions_list.html

 {% extends "base-apply.html" %}
+{% block title %}Revisions for {{ submission.title }}{% endblock %}
+
 {% block content %}
 <div class="wrapper wrapper--breakout wrapper--admin">
     <div class="wrapper wrapper--medium">
-        <h2 class="heading heading--no-margin">Revisions</h2>
         <h5>For <a href="{% url "funds:submission" submission.id %}">{{ submission.title }}</a></h5>
+            <h1 class="beta heading heading--no-margin heading--bold">Revisions</h1>
     </div>
 </div>