Fix wording of ChangeLog and 3DES_REMOVE docs

ChangeLog

diff --git a/ChangeLog b/ChangeLog
index abd12d5..ee50013 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -8,7 +8,12 @@
      at the cost of additional lifetime constraints on the input
      buffer, but at the benefit of reduced RAM consumption.
    * Add MBEDTLS_REMOVE_3DES_CIPHERSUITES to allow removing 3DES ciphersuites
-     from the default list (inactive by default).
+     from the default list (enabled by default). See
+     https://sweet32.info/SWEET32_CCS16.pdf.
+
+API Changes
+   * Add a new X.509 API call `mbedtls_x509_parse_der_nocopy()`.
+     See the Features section for more information.
 
 Bugfix
    * Fix a compilation issue with mbedtls_ecp_restart_ctx not being defined
@@ -53,10 +58,6 @@
    * Ensure that ssl-opt.h can be run in OS X. #2029
    * Ciphersuites based on 3DES now have the lowest priority by default.
 
-API Changes
-   * Add a new X.509 API call `mbedtls_x509_parse_der_nocopy()`.
-     See the Features section for more information.
-
 = mbed TLS 2.16.0 branch released 2018-12-21
 
 Features