Corrected an old URL for past meeting procedures.

- Legacy-Id: 16184

ietf/templates/base/menu.html

@@ -109,7 +109,7 @@
   <li><a href="/meeting/materials/">Materials</a></li>
   <li><a href="/meeting/floor-plan/">Floor plan</a></li>
   <li><a href="{% url 'ietf.meeting.views.important_dates' %}">Important dates</a></li>
-  <li><a href="https://www.ietf.org/meeting/proceedings.html">Past proceedings</a></li>
+  <li><a href="https://www.ietf.org/how/meetings/past/">Past proceedings</a></li>
   <li><a href="/meeting/upcoming">Upcoming</a></li>
   <li><a href="/meeting/past">Past</a></li>
   <li><a href="/secr/sreq/">Request a session</a></li>