Man pages matching name gnutls_tpm_privkey_delete in section 3:

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