Show [] around string slices when showing the text
Show [] around string slices when showing the text

This means things like autogenerated docs will show

`--filename=[]`   instead of just `--filename=`

smarterclayton/pflag,technoweenie/pflag,eparis/pflag,EricLagergren/pflag,liggitt/pflag,liggitt/pflag,spf13/pflag,dvln/pflag,Fiery/pflag,dvln/pflag,jrossi/pflag,b1v1r/pflag,spf13/pflag,EricLagergren/pflag,janetkuo/pflag,jrossi/pflag,b1v1r/pflag