Improve comments about exit status values
Improve comments about exit status values

drpowell/biotool,bjpop/biotool,bionitio-team/bionitio,biotool-paper/biotool,biotool-paper/biotool,biotool-paper/biotool,biotool-paper/biotool,lonsbio/biotool,biotool-paper/biotool,lonsbio/biotool,drpowell/biotool,bjpop/biotool,bjpop/biotool,biotool-paper/biotool,bjpop/biotool,drpowell/biotool,lonsbio/biotool,bjpop/biotool,bjpop/biotool,drpowell/biotool,drpowell/biotool,biotool-paper/biotool,bjpop/biotool,biotool-paper/biotool,biotool-paper/biotool,drpowell/biotool,biotool-paper/biotool,drpowell/biotool,bjpop/biotool,drpowell/biotool,drpowell/biotool,lonsbio/biotool,bjpop/biotool,drpowell/biotool,bjpop/biotool