Removed a statement about IETF being an activity of the Internet Society from a template file, and tweaked the remaining text.

 - Legacy-Id: 16017

Author: levkowetz

ietf/templates/submit/problem-reports-footer.html

@@ -1,5 +1,4 @@
 {# Copyright The IETF Trust 2015, All Rights Reserved #}{% load origin %}{% origin %}
 <p>
-  The IETF is an organized activity of the <a href="https://www.isoc.org">Internet Society</a>.
-  Please send problem reports to <a href="mailto:ietf-action@ietf.org">ietf-action@ietf.org</a>.
+  Please send submission problem reports to <a href="mailto:ietf-action@ietf.org">ietf-action@ietf.org</a>.
 </p>