When displaying the error message "This user has super-user access. Embedding widgets with super-user token authentication is not allowed. Check the FAQ for more info." There is no link to a FAQ.
Display a link to the related FAQ.
Only the message is displayed.
It looks like the link is not added any more in the message: https://github.com/matomo-org/matomo/blob/16c2b8c1c31209ab84ff4cc46cb8837f1a611772/core/API/Request.php#L472