Man pages matching name gnutls_pkcs12_bag_set_data in section 3:

gnutls_pkcs12_bag_set_data.3.en	debian 10 / gnutls-doc
gnutls_pkcs12_bag_set_data.3.en	debian 11 / gnutls-doc
gnutls_pkcs12_bag_set_data.3.en	debian 12 / gnutls-doc