error in validation documentation?

I've been reading the documentation on validation, (https://codeigniter4.github.io/userguide...ation.html) and following the mini-tutorial. But it results in an error: "Undefined property: App\Controllers\Form::$validation".

In the Form.php controller, shouldn't

Code:

'validation' => $this->validation

be

Code:

'validation' => $this->validator

?

I'm very new to codeigniter, so apologies if I'm misunderstanding something!