/**
* Return an instance of the question editing form definition. This looks for a
* class called edit_{$this->name()}_question_form in the file
- * {$CFG->docroot}/question/type/{$this->name()}/edit_{$this->name()}_question_form.php
+ * {$CFG->dirroot}/question/type/{$this->name()}/edit_{$this->name()}_question_form.php
* and if it exists returns an instance of it.
*
* @param string $submiturl passed on to the constructor call.