Man pages matching name classes.conf in section 5:

classes.conf.5.de	debian 10 / cups-daemon
classes.conf.5.en	debian 10 / cups-daemon
classes.conf.5.fr	debian 10 / cups-daemon
classes.conf.5.de	debian 11 / cups-daemon
classes.conf.5.en	debian 11 / cups-daemon
classes.conf.5.fr	debian 11 / cups-daemon
classes.conf.5.de	debian 12 / cups-daemon
classes.conf.5.en	debian 12 / cups-daemon
classes.conf.5.fr	debian 12 / cups-daemon
classes.conf.5.pt	debian 12 / cups-daemon