Update link to handling ballot positions. Fixes ietf-tools#3208. Commit ready for merge.

 - Legacy-Id: 19948

Author: rjsparks

ietf/templates/doc/ballot/ballot_comment_mail.txt

@@ -6,7 +6,7 @@ email addresses included in the To and CC lines. (Feel free to cut this
 introductory paragraph, however.)
 
 {% if doc.type_id == "draft" and doc.stream_id != "irtf" %}
-Please refer to https://www.ietf.org/blog/handling-iesg-ballot-positions/
+Please refer to https://www.ietf.org/about/groups/iesg/statements/handling-ballot-positions/ 
 for more information about how to handle DISCUSS and COMMENT positions.
 {% endif %}