Docs: Clarify model used in DjangoModelPermissions (#8615)

I found it unclear how the model was determined for `DjangoModelPermissions`. The docs say you need a `queryset` or `get_queryset`, but not that the value returned from those is what determines the model that is used.

Author: WillowP

docs/api-guide/permissions.md

@@ -171,7 +171,7 @@ This permission is suitable if you want to your API to allow read permissions to
 
 ## DjangoModelPermissions
 
-This permission class ties into Django's standard `django.contrib.auth` [model permissions][contribauth].  This permission must only be applied to views that have a `.queryset` property or `get_queryset()` method. Authorization will only be granted if the user *is authenticated* and has the *relevant model permissions* assigned.
+This permission class ties into Django's standard `django.contrib.auth` [model permissions][contribauth].  This permission must only be applied to views that have a `.queryset` property or `get_queryset()` method. Authorization will only be granted if the user *is authenticated* and has the *relevant model permissions* assigned. The appropriate model is determined by checking `get_queryset().model` or `queryset.model`.
 
 * `POST` requests require the user to have the `add` permission on the model.
 * `PUT` and `PATCH` requests require the user to have the `change` permission on the model.