Add adrf references to inform that async versions of these classes exist

Author: maerteijn

docs/api-guide/serializers.md

@@ -424,6 +424,10 @@ You can provide arbitrary additional context by passing a `context` argument whe
 
 The context dictionary can be used within any serializer field logic, such as a custom `.to_representation()` method, by accessing the `self.context` attribute.
 
+## Async Serializer
+
+An async version of the `Serializer` class is available via the [adrf](https://github.com/em1208/adrf) package.
+
 ---
 
 # ModelSerializer
@@ -661,6 +665,10 @@ Called to generate a serializer field for the serializer's own `url` field. The
 Called when the field name did not map to any model field or model property.
 The default implementation raises an error, although subclasses may customize this behavior.
 
+## Async ModelSerializer
+
+An async version of the `ModelSerializer` class is available via the [adrf](https://github.com/em1208/adrf) package.
+
 ---
 
 # HyperlinkedModelSerializer
@@ -862,6 +870,11 @@ Occasionally you might need to explicitly specify how the child and parent class
             # Instantiate the parent list serializer.
             return CustomListSerializer(*args, **kwargs)
 
+
+## Async ListSerializer
+
+An async version of the `ListSerializer` class is available via the [adrf](https://github.com/em1208/adrf) package.
+
 ---
 
 # BaseSerializer
@@ -1005,6 +1018,10 @@ The following class is an example of a generic serializer that can handle coerci
                     output[attribute_name] = str(attribute)
             return output
 
+## Async BaseSerializer
+
+An async version of the `BaseSerializer` class is available via the [adrf](https://github.com/em1208/adrf) package.
+
 ---
 
 # Advanced serializer usage

docs/api-guide/views.md

@@ -161,6 +161,8 @@ By default only `GET` methods will be accepted. Other methods will respond with
             return Response({"message": "Got some data!", "data": request.data})
         return Response({"message": "Hello, world!"})
 
+### Async support
+An async version of the `@api_view` decorator is available via the [adrf](https://github.com/em1208/adrf) package.
 
 ## API policy decorators
 
@@ -224,4 +226,3 @@ You may pass `None` in order to exclude the view from schema generation.
 [throttling]: throttling.md
 [schemas]: schemas.md
 [classy-drf]: http://www.cdrf.co
-

docs/api-guide/viewsets.md

@@ -235,6 +235,11 @@ Alternatively, you can use the `url_name` attribute set by the `@action` decorat
 
 The `url_name` argument for `.reverse_action()` should match the same argument to the `@action` decorator. Additionally, this method can be used to reverse the default actions, such as `list` and `create`.
 
+
+## Async ViewSets
+
+An async version of the `ViewSet` class is available via the [adrf](https://github.com/em1208/adrf) package.
+
 ---
 
 # API Reference