Broken "Learn more" link in Tor Browser Security Settings fails to open https://tb-manual.torproject.org/security-slider.html

To duplicate the issue, follow this path:

Torbutton / Security Settings / Tor Browser Security Settings / Learn more / https://tb-manual.torproject.org/security-slider.html / Not Found The requested URL /security-slider.html was not found on this server. Apache Server at tb-manual.torproject.org Port 443

Trac:
Username: monmire