fix: clarify comment at beginning of nonwg lists page (#7341)

ietf/templates/mailinglists/nonwg.html

@@ -10,10 +10,10 @@
     {% origin %}
     <h1>Other (not Working Group) email lists</h1>
     <p>Guidelines for these lists, including how to request a
-    new one to be created, are at
-    <a href="https://www.ietf.org/how/lists/nonwglist-guidelines/">
-	 https://www.ietf.org/how/lists/nonwglist-guidelines/
-    </a>
+    new one to be created, can be found on the
+    <a href="https://www.ietf.org/participate/lists/nonwglist-guidelines/">
+	 Non–Working Group email list guidelines
+    </a> webpage.
     </p>
     {% cache 900 nonwglisttable %}
     <table class="table table-sm table-striped tablesorter">