Get rid of unnecessary barrier. Improve comment.

[pintos-anon] / grading / userprog / sample.inc

char sample[] = {
  "Amazing Electronic Fact: If you scuffed your feet long enough without\n"
  "touching anything, you would build up so many electrons that your\n"
  "finger would explode!  But this is nothing to worry about unless you\n"
  "have carpeting.\n" 
};