Man pages matching name pam_ssh_agent_auth in section 8:

pam_ssh_agent_auth.8.en	debian 10 / libpam-ssh-agent-auth
pam_ssh_agent_auth.8.en	debian 11 / libpam-ssh-agent-auth
pam_ssh_agent_auth.8.en	debian 12 / libpam-ssh-agent-auth