Improve ChangeLog wording for key export

Signed-off-by: Hanno Becker <hanno.becker@arm.com>
diff --git a/ChangeLog.d/key-export.txt b/ChangeLog.d/key-export.txt
index 10d8c89..2fc01a4 100644
--- a/ChangeLog.d/key-export.txt
+++ b/ChangeLog.d/key-export.txt
@@ -1,13 +1,10 @@
 API changes
    * mbedtls_ssl_conf_export_keys_ext_cb() and
-     mbedtls_ssl_conf_export_keys_cb() have been removed
-     and replaced by a new API
-     mbedtls_ssl_set_export_keys_cb().
-   * The signature of key export callbacks configured via
-     mbedtls_ssl_set_export_keys_cb() is different from that
-     of the previous mbedtls_ssl_conf_export_keys_cb(): First,
-     raw keys and IVs are no longer exported. Further, callbacks
-     now receive an additional parameter indicating the type
-     of secret that's being exported, paving the way for the
-     larger number of secrets in TLS 1.3. Finally, the key export
-     callback and context are now connection-specific.
+     mbedtls_ssl_conf_export_keys_cb() have been removed and
+     replaced by a new API mbedtls_ssl_set_export_keys_cb().
+     Raw keys and IVs are no longer passed to the callback.
+     Further, callbacks now receive an additional parameter
+     indicating the type of secret that's being exported,
+     paving the way for the larger number of secrets
+     in TLS 1.3. Finally, the key export callback and
+     context are now connection-specific.