Man pages matching name proc_pid_mounts in section 5:

proc_pid_mounts.5.en	debian 13 / manpages
proc_pid_mounts.5.de	debian 13 / manpages-de
proc_pid_mounts.5.es	debian 13 / manpages-es
proc_pid_mounts.5.fr	debian 13 / manpages-fr
proc_pid_mounts.5.pl	debian 13 / manpages-pl
proc_pid_mounts.5.ro	debian 13 / manpages-ro