Update scratchTutorial.md
Updated 2.png, 3.png, 4.png for rtkrpimcb change.
Merge branch 'patch-1' of https://github.com/tvoverbeek/RTK-000-003 into patch-1
Merge pull request #19 from tvoverbeek/patch-1

Change rtkmotorcon to rtkrpimcb for ScratchGPIO5, Thanks Tvoverbeek.