Man pages matching name proc_mtrr in section 5:

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