Make it more clear to add django_filters to INSTALLED_APPS in docs. (encode#7535)

Author: johnthagen

docs/api-guide/filtering.md

@@ -145,10 +145,18 @@ Note that you can use both an overridden `.get_queryset()` and generic filtering
 The [`django-filter`][django-filter-docs] library includes a `DjangoFilterBackend` class which
 supports highly customizable field filtering for REST framework.
 
-To use `DjangoFilterBackend`, first install `django-filter`. Then add `django_filters` to Django's `INSTALLED_APPS`
+To use `DjangoFilterBackend`, first install `django-filter`.
 
  pip install django-filter
 
+Then add `'django_filters'` to Django's `INSTALLED_APPS`:
+
+ INSTALLED_APPS = [
+  ...
+  'django_filters',
+  ...
+ ]
+
 You should now either add the filter backend to your settings:
 
  REST_FRAMEWORK = {
@@ -365,4 +373,4 @@ The [djangorestframework-word-filter][django-rest-framework-word-search-filter]
 [django-url-filter]: https://github.com/miki725/django-url-filter
 [drf-url-filter]: https://github.com/manjitkumar/drf-url-filters
 [HStoreField]: https://docs.djangoproject.com/en/3.0/ref/contrib/postgres/fields/#hstorefield
-[JSONField]: https://docs.djangoproject.com/en/3.0/ref/contrib/postgres/fields/#jsonfield
+[JSONField]: https://docs.djangoproject.com/en/3.0/ref/contrib/postgres/fields/#jsonfield