Man pages matching name pppoe.conf in section 5:

pppoe.conf.5.ja	debian 10 / manpages-ja
pppoe.conf.5.en	debian 10 / pppoe
pppoe.conf.5.ja	debian 11 / manpages-ja
pppoe.conf.5.en	debian 11 / pppoe
pppoe.conf.5.ja	debian 12 / manpages-ja
pppoe.conf.5.en	debian 12 / pppoe