fix typo tutorial step1
Hi, Maybe I'm confused, but I think this is a typo. Checked history and it was like this from the beginning. Apart from the logic in it, I checked and the output if the command is run as it is now:
CMake Error: The source directory "C:/projects/tutorial_cmake/Step1" does not exist. Specify --help for usage, or press the help button on the CMake GUI.