Improve Changelog wording

Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
diff --git a/ChangeLog.d/fix_tls_alert_codes.txt b/ChangeLog.d/fix_tls_alert_codes.txt
index abe3a5e..10235d7 100644
--- a/ChangeLog.d/fix_tls_alert_codes.txt
+++ b/ChangeLog.d/fix_tls_alert_codes.txt
@@ -1,6 +1,5 @@
 Bugfix
-   * Fix the alert raised when a client requests an invalid
-   * fragment length, as per RFC6066 section 4. We now alert with
-   * MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER. Similarly, raise
-   * MBEDTLS_SSL_ALERT_MSG_DECRYPT_ERROR for an invalid finished
-   * message, as per RFC5247 section 7.2.2.
+   * Fix which alert is sent in some cases to conform to the
+     applicable RFC: on an invalid Finished message value, an
+     invalid max_fragment_length extension, or an
+     unsupported extension used by the server.