io.files.info.unix: fix IN: in docs
io.files.info.unix: fix IN: in docs

mcandre/factor,erg/factor,mcandre/factor,mcandre/factor,mcandre/factor,erg/factor,erg/factor,mcandre/factor,mcandre/factor,erg/factor,erg/factor,mcandre/factor,erg/factor,erg/factor