Improve descriptions of available options.
Improve descriptions of available options.

kwantam/coreutils,Gianbaoluo/coreutils,filmor/coreutils,Shtong/coreutils,retep998/coreutils,Shir0kamii/coreutils,beni55/coreutils,dennis/coreutils,Heather/coreutils,silvio/rust-coreutils,retep998/coreutils,uutils/coreutils,dbrgn/coreutils,steveklabnik/coreutils,ebfe/coreutils,Shtong/coreutils,tempbottle/coreutils,Gianbaoluo/coreutils,sshling/coreutils,kevgeniy/coreutils,hexsel/coreutils,uutils/coreutils,Arcterus/coreutils,dbrgn/coreutils,ebfe/coreutils,kwantam/coreutils,dbrgn/coreutils,bundai223/coreutils,jbcrail/coreutils,steveklabnik/coreutils,Shir0kamii/coreutils,hexsel/coreutils,tempbottle/coreutils,kevgeniy/coreutils,Heather/coreutils,dennis/coreutils,bundai223/coreutils,kball/coreutils,kball/coreutils,beni55/coreutils,wimh/coreutils,sshling/coreutils,keunwoo/coreutils,samfoo/coreutils,filmor/coreutils,silvio/rust-coreutils,Arcterus/coreutils,samfoo/coreutils,efuquen/coreutils,mauricio/coreutils,wimh/coreutils,uutils/coreutils,mauricio/coreutils,jbcrail/coreutils,keunwoo/coreutils,efuquen/coreutils