Man pages matching name gnutls_pkcs12_simple_parse in section 3:

gnutls_pkcs12_simple_parse.3.en	debian 10 / gnutls-doc
gnutls_pkcs12_simple_parse.3.en	debian 11 / gnutls-doc
gnutls_pkcs12_simple_parse.3.en	debian 12 / gnutls-doc