testing: fix wording in explanation of potential bug TBR=rsc
testing: fix wording in explanation of potential bug
TBR=rsc

R=rsc
CC=golang-dev
http://codereview.appspot.com/5504075

h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang