Man pages matching name gnutls_pcert_list_import_x509_file in section 3:

gnutls_pcert_list_import_x509_file.3.en	debian 10 / gnutls-doc
gnutls_pcert_list_import_x509_file.3.en	debian 11 / gnutls-doc
gnutls_pcert_list_import_x509_file.3.en	debian 12 / gnutls-doc