build: fix typos in run.rc
build: fix typos in run.rc

LGTM=bradfitz
R=jas, bradfitz
CC=golang-codereviews
https://codereview.appspot.com/52940044

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