Suggest / Add instructor notes for Episode 9: Transformations - Undo and Redo

[ostephens]

Following the transition to the new Workbench, instructor notes can be integrated into episodes/lessons. This issue is for

Episode 9: Transformations - Undo and Redo

Some notes could be copied from the existing notes, but this is also a good opportunity to make sure we have all appropriate instructor notes in place so we can use this issue for suggestions for any additional notes that should also be added.

Read for details on how to format instructor notes.