Update some comments

Signed-off-by: Pengyu Lv <pengyu.lv@arm.com>
diff --git a/.travis.yml b/.travis.yml
index 39b742d..1062d99 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -52,7 +52,7 @@
         - programs/test/selftest
         - tests/scripts/test_psa_constant_names.py
         - tests/ssl-opt.sh
-        # Modern OpenSSL does not support fixed ECDH or null ciphers.
+        # Modern OpenSSL does not support null ciphers.
         - tests/compat.sh -p OpenSSL -e 'NULL'
         - tests/scripts/travis-log-failure.sh
         # GnuTLS supports CAMELLIA but compat.sh doesn't properly enable it.