Man pages matching name gnutls_privkey_import_rsa_raw in section 3:

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