Docs: Provide full params in example

Ref feedback https://github.com/encode/django-rest-framework/pull/5354/files/b52e372f8f936204753b17fe7c9bfb517b93a045#r137254795

Author: carltongibson

docs/api-guide/views.md

@@ -195,7 +195,7 @@ decorator. For example:
     from rest_framework.schemas import AutoSchema
 
     class CustomAutoSchema(AutoSchema):
-        def get_link(*args):
+        def get_link(self, path, method, base_url):
             # override view introspection here...
 
     @api_view(['GET'])