Man pages matching name gnutls_srtp_set_mki in section 3:

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