Man pages matching name dpkg-vendor in section 1:

dpkg-vendor.1.de	debian 10 / dpkg-dev
dpkg-vendor.1.en	debian 10 / dpkg-dev
dpkg-vendor.1.fr	debian 10 / dpkg-dev
dpkg-vendor.1.nl	debian 10 / dpkg-dev
dpkg-vendor.1.de	debian 11 / dpkg-dev
dpkg-vendor.1.en	debian 11 / dpkg-dev
dpkg-vendor.1.fr	debian 11 / dpkg-dev
dpkg-vendor.1.nl	debian 11 / dpkg-dev
dpkg-vendor.1.pt	debian 11 / dpkg-dev
dpkg-vendor.1.sv	debian 11 / dpkg-dev
dpkg-vendor.1.de	debian 12 / dpkg-dev
dpkg-vendor.1.en	debian 12 / dpkg-dev
dpkg-vendor.1.fr	debian 12 / dpkg-dev
dpkg-vendor.1.nl	debian 12 / dpkg-dev
dpkg-vendor.1.pt	debian 12 / dpkg-dev
dpkg-vendor.1.sv	debian 12 / dpkg-dev