Documentation error: AbstractApplication.is_usable does not receive a HTTP request

[bastbnl]

From the documentation found here:
https://github.com/jazzband/django-oauth-toolkit/blob/1.3.2/oauth2_provider/models.py#L172

...
        :param request: The HTTP request being processed.

I found that it's not a Django HTTP request, but instead an oauthlib.common.Request. I also learned the method is called twice: one using the caller provided scope, once with a None scope, but that may be related to DOT version 1.1.3.

I verified master and I noticed the same doc. PR coming up.