Update 3-class-based-views.md

docs/tutorial/3-class-based-views.md

@@ -142,6 +142,15 @@ Using the mixin classes we've rewritten the views to use slightly less code than
         queryset = Snippet.objects.all()
         serializer_class = SnippetSerializer
     
+    class SnippetUpdate(generics.UpdateAPIView):
+        queryset = Snippet.objects.all()
+        serializer_class = SnippetSerializer
+        
+    class SnippetDestroy(generics.DestroyAPIView):
+        queryset = Snippet.objects.all()
+        serializer_class = SnippetSerializer
+
+
 Wow, that's pretty concise.  We've gotten a huge amount for free, and our code looks like good, clean, idiomatic Django.
 
 Next we'll move onto [part 4 of the tutorial][tut-4], where we'll take a look at how we can deal with authentication and permissions for our API.