added more content for AsyncSingleObjectMixin

Author: amirreza8002

docs/views/async-class-based-views/detail.md

@@ -32,7 +32,13 @@ some of the base classes for `DetailView` have been re-written as async:
 
 #### AsyncSingleObjectMixin
 
-like [SingleObjectMixin](https://docs.djangoproject.com/en/5.1/ref/class-based-views/mixins-single-object/#django.views.generic.detail.SingleObjectMixin) but `get_object()` and `get_queryset()` are async.
+like [SingleObjectMixin](https://docs.djangoproject.com/en/5.1/ref/class-based-views/mixins-single-object/#django.views.generic.detail.SingleObjectMixin)
+with these differences:
+
+* inherits from [AsyncContextMixin](base.md#asynccontextmixin)
+* `get_object()` method is async.
+* `get_queryset()` method is async.
+* `get_context_data()` method is async.
 
 #### AsyncBaseDetailView