Improve ChangeLog and migration guide entries

Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
diff --git a/ChangeLog.d/mandatory-rng-param.txt b/ChangeLog.d/mandatory-rng-param.txt
index 4e04248..39ee335 100644
--- a/ChangeLog.d/mandatory-rng-param.txt
+++ b/ChangeLog.d/mandatory-rng-param.txt
@@ -1,12 +1,14 @@
 API changes
-   * For all functions that take an RNG parameter, this parameter is now
-     mandatory (that is, NULL is not an acceptable value). Functions which
-     previously accepted NULL and now reject it are: the X.509 CRT and CSR
-     writing functions; the PK sign and decrypt function; the RSA encrypt,
-     decrypt, sign and private functions; the function in DHM and ECDH that
-     compute the share secret; the scalar multiplication functions in ECP.
+   * For all functions that take a random number generator (RNG) as a
+     parameter, this parameter is now mandatory (that is, NULL is not an
+     acceptable value). Functions which previously accepted NULL and now
+     reject it are: the X.509 CRT and CSR writing functions; the PK and RSA
+     sign and decrypt function; mbedtls_rsa_private(); the functions
+     in DHM and ECDH that compute the shared secret; the scalar multiplication
+     functions in ECP.
    * The following functions now require an RNG parameter:
      mbedtls_ecp_check_pub_priv(), mbedtls_pk_check_pair(),
      mbedtls_pk_parse_key(), mbedtls_pk_parse_keyfile().
+Removals
    * The configuration option MBEDTLS_ECP_NO_INTERNAL_RNG has been removed as
      it no longer had any effect.