Fix completion mistake in changelog entry

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>

Author: gilles-peskine-arm

ChangeLog

@@ -3,10 +3,10 @@ Mbed TLS ChangeLog (Sorted per branch, date)
 = Mbed TLS 3.6.2 branch released 2024-10-14
 
 Security
-   * Fix a buffer underrun in mbedtls_pk_write_pubkey_der() when
+   * Fix a buffer underrun in mbedtls_pk_write_key_der() when
      called on an opaque key, MBEDTLS_USE_PSA_CRYPTO is enabled,
      and the output buffer is smaller than the actual output.
-     Fix a related buffer underrun in mbedtls_pk_write_pubkey_pem()
+     Fix a related buffer underrun in mbedtls_pk_write_key_pem()
      when called on an opaque RSA key, MBEDTLS_USE_PSA_CRYPTO is enabled
      and MBEDTLS_MPI_MAX_SIZE is smaller than needed for a 4096-bit RSA key.
      CVE-2024-49195