Docs: --a -> -a (fixes #1217)
Docs: --a -> -a (fixes #1217)

mitnk/letsencrypt,Sveder/letsencrypt,jtl999/certbot,piru/letsencrypt,BillKeenan/lets-encrypt-preview,goofwear/letsencrypt,jsha/letsencrypt,BillKeenan/lets-encrypt-preview,xgin/letsencrypt,goofwear/letsencrypt,jsha/letsencrypt,dietsche/letsencrypt,lmcro/letsencrypt,bsmr-misc-forks/letsencrypt,lbeltrame/letsencrypt,wteiken/letsencrypt,DavidGarciaCat/letsencrypt,stweil/letsencrypt,VladimirTyrin/letsencrypt,piru/letsencrypt,brentdax/letsencrypt,mrb/letsencrypt,twstrike/le_for_patching,mitnk/letsencrypt,brentdax/letsencrypt,xgin/letsencrypt,martindale/letsencrypt,thanatos/lets-encrypt-preview,kuba/letsencrypt,mrb/letsencrypt,TheBoegl/letsencrypt,letsencrypt/letsencrypt,bsmr-misc-forks/letsencrypt,dietsche/letsencrypt,twstrike/le_for_patching,Sveder/letsencrypt,lmcro/letsencrypt,thanatos/lets-encrypt-preview,letsencrypt/letsencrypt,kuba/letsencrypt,VladimirTyrin/letsencrypt,stweil/letsencrypt,lbeltrame/letsencrypt,martindale/letsencrypt,sjerdo/letsencrypt,DavidGarciaCat/letsencrypt,sjerdo/letsencrypt,wteiken/letsencrypt,jtl999/certbot,TheBoegl/letsencrypt