Man pages matching name gnutls_ocsp_resp_verify_direct in section 3:

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