Minor tweak to exercise.js
Minor tweak to exercise.js

RJFreund/OpenDSA,RJFreund/OpenDSA,RJFreund/OpenDSA,RJFreund/OpenDSA,RJFreund/OpenDSA,RJFreund/OpenDSA,RJFreund/OpenDSA,vkaravir/JSAV,RJFreund/OpenDSA,vkaravir/JSAV