On grade/edit/scale/edit.php the help link in the ?-Icons are linking to a non existnig site
http://docs.moodle.org/404/en/grade/scale

The correct link should be *https://docs.moodle.org/404/en/Scales*

The help link for the site is http://docs.moodle.org/404/en/admin/grade/edit/scale/edit and forwards to the correct site.