Man pages matching name negotiate_kerberos_auth in section 8:

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