[interfaces.py] add missing :raises: for iDisplay.input
[interfaces.py] add missing :raises: for iDisplay.input

bsmr-misc-forks/letsencrypt,jsha/letsencrypt,thanatos/lets-encrypt-preview,letsencrypt/letsencrypt,dietsche/letsencrypt,brentdax/letsencrypt,mitnk/letsencrypt,lmcro/letsencrypt,wteiken/letsencrypt,DavidGarciaCat/letsencrypt,lmcro/letsencrypt,brentdax/letsencrypt,jtl999/certbot,TheBoegl/letsencrypt,mitnk/letsencrypt,wteiken/letsencrypt,DavidGarciaCat/letsencrypt,stweil/letsencrypt,bsmr-misc-forks/letsencrypt,stweil/letsencrypt,jtl999/certbot,dietsche/letsencrypt,letsencrypt/letsencrypt,jsha/letsencrypt,TheBoegl/letsencrypt,thanatos/lets-encrypt-preview