Update example
Update example

Using the variable_arity flag in DefineAction() calls instead of using a
negative arity.

smcclellan/horsewhisperer,parisiale/horsewhisperer,pcarlisle/horsewhisperer,smcclellan/horsewhisperer,pcarlisle/horsewhisperer,parisiale/horsewhisperer,puppetlabs/horsewhisperer,puppetlabs/horsewhisperer