Update repository instructions
Update repository instructions

This PR updates the command-line prompt for requesting a repository from the user. This updates the instructions to what is actually expected from the app (owner/repo) versus (name/owner).
bravit/teachers_pet,education/teachers_pet,iit-cs579/teachers_pet,robertmorrispainter/teachers_pet,davep3rrett/teachers_pet,FreeSchoolHackers/teachers_pet,cs109/teachers_pet,tarebyte/teachers_pet,efthym/teachers_pet