Switched the known users link over to mediawiki

--HG--
extra : convert_revision : svn%3Afdd8eb12-d10e-0410-9acb-85c331704f74/trunk%403142

docs/docs/main_menu.xml

@@ -301,7 +301,7 @@
             </item>
             <item>
                <name>Known Users</name>
-               <link>http://dclib.wiki.sourceforge.net/dlib_users</link>
+               <link>https://sourceforge.net/apps/mediawiki/dclib/index.php?title=Known_users</link>
             </item>
          </section>