update url of Bootstrap 4 - Tempus Dominus

pages/forms/advanced.html

@@ -1323,7 +1323,7 @@
                 <!-- /.form group -->
               </div>
                 <div class="card-footer">
-                  Visit <a href="https://tempusdominus.github.io/bootstrap-4/Usage/">tempusdominus </a> for more examples and information about
+                  Visit <a href="https://getdatepicker.com/5-4/">tempusdominus </a> for more examples and information about
                   the plugin.
                 </div>
               <!-- /.card-body -->