Man pages matching name nginx in section 8:

nginx.8.en	debian 10 / nginx-extras
nginx.8.en	debian 10 / nginx-full
nginx.8.en	debian 10 / nginx-light
nginx.8.en	debian 11 / nginx-core
nginx.8.en	debian 11 / nginx-extras
nginx.8.en	debian 11 / nginx-light
nginx.8.ja	debian 12 / manpages-ja
nginx.8.en	debian 12 / nginx