fix: open issue in /juju/docs repo instead of /canonical/juju.is (#559)

templates/docs/document.html

@@ -131,7 +131,7 @@ <h4 class="p-table-of-contents__header">On this page</h4>
           Last updated {{ document.updated }}. 
           <a href="{{ forum_url }}{{ document.topic_path }}">Help improve this document in the forum</a>
           or
-          <a href="https://github.com/canonical/juju.is/issues/new?title=Documentation: {{ document.title }}&body=Docs page: {{ request.url }}%0A%0ADocs source: {{ forum_url }}{{ document.topic_path }}%0A%0AIssue: Please write your issue here.&labels=documentation">
+          <a href="https://github.com/juju/docs/issues/new?title=Documentation: {{ document.title }}&body=Docs page: {{ request.url }}%0A%0ADocs source: {{ forum_url }}{{ document.topic_path }}%0A%0AIssue: Please write your issue here.">
             File an issue
           </a>.                   
         </p>