Man pages matching name evp_pkey_meth_get_count in section 3ssl:

EVP_PKEY_meth_get_count.3ssl.en	debian 10 / libssl-doc
EVP_PKEY_meth_get_count.3ssl.en	debian 11 / libssl-doc
EVP_PKEY_meth_get_count.3ssl.en	debian 12 / libssl-doc