Update comments for net/data/verify_certificate_chain_unittest/

net/data/verify_certificate_chain_unittest/intermediate-lacks-signing-key-usage/generate-chains.py

Index: net/data/verify_certificate_chain_unittest/intermediate-lacks-signing-key-usage/generate-chains.py
diff --git a/net/data/verify_certificate_chain_unittest/intermediate-lacks-signing-key-usage/generate-chains.py b/net/data/verify_certificate_chain_unittest/intermediate-lacks-signing-key-usage/generate-chains.py
index 42cb22fdc18e7ae1f184e3d0ffd67c4a733c4b50..657beabbd68aa3dd4aae222c1e6b06d0911a5edf 100755
--- a/net/data/verify_certificate_chain_unittest/intermediate-lacks-signing-key-usage/generate-chains.py
+++ b/net/data/verify_certificate_chain_unittest/intermediate-lacks-signing-key-usage/generate-chains.py
@@ -3,16 +3,14 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-"""Certificate chain with 1 intermediate and a trusted root. The intermediate
-contains a keyUsage extension, HOWEVER it does not contain the keyCertSign bit.
-Hence validation is expected to fail."""
+"""Certificate chain where the intermediate lacks a keyUsage extension."""
 
 import sys
 sys.path += ['..']
 
 import common
 
-# Self-signed root certificate (used as trust anchor).
+# Self-signed root certificate.
 root = common.create_self_signed_root_certificate('Root')
 
 # Intermediate that is missing keyCertSign.