Do you see it in the table?About state 10, what does it mean?is it shown in the table?
You have a state machine that only needs three defined states. But the implementation WILL have at least four states. So the question is how to deal with any unused states. The second slide explicitly indicates that the table is treating anything associated with that state as a "don't care". That may or may not be reasonable, but it is how they have chosen to do it.