Man pages matching name par::filter::patchcontent in section 3pm:

PAR::Filter::PatchContent.3pm.en	debian 10 / libpar-packer-perl
PAR::Filter::PatchContent.3pm.en	debian 11 / libpar-packer-perl
PAR::Filter::PatchContent.3pm.en	debian 12 / libpar-packer-perl