do_now_13.md mistake

[jdonwells]

In step 3 we tell them to save the project as DoNow1.3. At the bottom of the page, we ask them to save the project as Donow12. I feel like these should be the same.

Also given that the lab asks them to modify the do now project, perhaps we should have them name it Lab1.3? Since the lab is a superset of the do now do we need both?