Man pages matching name gnutls_dtls_set_timeouts in section 3:

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