Man pages matching name basic_getpwnam_auth in section 8:

basic_getpwnam_auth.8.en	debian 10 / squid
basic_getpwnam_auth.8.en	debian 11 / squid
basic_getpwnam_auth.8.en	debian 11 / squid-openssl
basic_getpwnam_auth.8.en	debian 12 / squid
basic_getpwnam_auth.8.en	debian 12 / squid-openssl