Renamed known users link to who uses dlib?

--HG--
extra : convert_revision : svn%3Afdd8eb12-d10e-0410-9acb-85c331704f74/trunk%403814

docs/docs/main_menu.xml

@@ -342,7 +342,7 @@
                <link>http://sourceforge.net/project/platformdownload.php?group_id=130373</link>
             </item>
             <item>
-               <name>Known Users</name>
+               <name>Who uses dlib?</name>
                <link>http://sourceforge.net/apps/mediawiki/dclib/index.php?title=Known_users</link>
             </item>
          </section>