Man pages matching name tmpfs in section 5:

tmpfs.5.en	debian 10 / initscripts
tmpfs.5.pl	debian 10 / manpages-pl
tmpfs.5.en	debian 11 / initscripts
tmpfs.5.pl	debian 11 / manpages-pl
tmpfs.5.en	debian 12 / manpages
tmpfs.5.ru	debian 12 / manpages-ru