python.cc: rename print_argument_check to print_argument_checks
python.cc: rename print_argument_check to print_argument_checks

This clarifies that checks for multiple arguments are being printed,
clearly distinguishing this function from the print_argument_check
function that will be extracted in the next commit.

Signed-off-by: Sven Verdoolaege <235c10dd23b819f81cdc9756a251746bc184cab6@gmail.com>

Meinersbur/isl,Meinersbur/isl,Meinersbur/isl,Meinersbur/isl