Man pages matching name devel::patchperl in section 3pm:

Devel::PatchPerl.3pm.en	debian 10 / libdevel-patchperl-perl
Devel::PatchPerl.3pm.en	debian 11 / libdevel-patchperl-perl
Devel::PatchPerl.3pm.en	debian 12 / libdevel-patchperl-perl