Change the acronym link on the html agenda page to go to the group's charter page rather than the charter's document page. Commit ready for merge.

 - Legacy-Id: 10379

Author: rjsparks

ietf/templates/meeting/agenda.html

@@ -242,7 +242,7 @@ <h2>
 
                     <td>
                       {% if item.session.historic_group.charter %}
-                        <a href="{{item.session.historic_group.charter.get_absolute_url}}">{{item.session.historic_group.acronym}}</a>
+                        <a href="{% url 'group_charter' acronym=item.session.historic_group.acronym %}">{{item.session.historic_group.acronym}}</a>
                       {% else %}
                         {{item.session.historic_group.acronym}}
                       {% endif %}