Man pages matching name nptl in section 7:

nptl.7.en	debian 10 / manpages
nptl.7.en	debian 11 / manpages
nptl.7.en	debian 12 / manpages
nptl.7.fr	debian 12 / manpages-fr
nptl.7.ru	debian 12 / manpages-ru