Man pages matching name gnutls_gost_paramset_get_oid in section 3:

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