Docs for `|crispy` filter imply you can call it with kwargs, is this a mistake?

* Package version: 1.11.2
* Django version: 3.1
* Python version: 3.7
* Template pack: bootstrap3

### Description:

The docs for the `crispy` filter say
https://github.com/django-crispy-forms/django-crispy-forms/blob/425b9182a501910746c2d6f34e0e5bab36984fd6/crispy_forms/templatetags/crispy_forms_filters.py#L43-L47

The function itself that implements the filter does accept those args `label_class` and `field_class`: https://github.com/django-crispy-forms/django-crispy-forms/blob/425b9182a501910746c2d6f34e0e5bab36984fd6/crispy_forms/templatetags/crispy_forms_filters.py#L28-L30

Is there any valid way to invoke the filter like that in Django templates? It looks like invalid syntax to me