Man pages matching name gnutls_auth_server_get_type in section 3:

gnutls_auth_server_get_type.3.en	debian 10 / gnutls-doc
gnutls_auth_server_get_type.3.en	debian 11 / gnutls-doc
gnutls_auth_server_get_type.3.en	debian 12 / gnutls-doc