fix policies URL

apps/editors/templates/editors/queue.html

@@ -176,7 +176,7 @@
 
 <div id="helpfulLinks">
 {{ _('Helpful Links:') }}
-<a href="{{ url('devhub.docs', ['policies']) }}" >{{ _('Add-on Policy') }}</a>
+<a href="{{ url('devhub.docs', doc_name='policies') }}">{{ _('Add-on Policy') }}</a>
 |
 <a href="http://wiki.mozilla.org/Update:Editors">{{ _("Editors' Guide") }}</a>
 </div>