Man pages matching name migrate-pubring-from-classic-gpg in section 1:

migrate-pubring-from-classic-gpg.1.en	debian 10 / gnupg-utils
migrate-pubring-from-classic-gpg.1.en	debian 11 / gnupg-utils
migrate-pubring-from-classic-gpg.1.en	debian 12 / gnupg-utils