Man pages matching name pnm in section 5:

pnm.5.pl	debian 10 / manpages-pl
pnm.5.en	debian 10 / netpbm
pnm.5.pl	debian 11 / manpages-pl
pnm.5.en	debian 11 / netpbm
pnm.5.de	debian 12 / manpages-de
pnm.5.en	debian 12 / netpbm