Man pages matching name i3-migrate-config-to-v4 in section 1:

i3-migrate-config-to-v4.1.en	debian 10 / i3-wm
i3-migrate-config-to-v4.1.en	debian 11 / i3-wm
i3-migrate-config-to-v4.1.en	debian 12 / i3-wm