Update comments for net/data/verify_certificate_chain_unittest/

net/data/verify_certificate_chain_unittest/intermediate-unknown-non-critical-extension/generate-chains.py

Index: net/data/verify_certificate_chain_unittest/intermediate-unknown-non-critical-extension/generate-chains.py
diff --git a/net/data/verify_certificate_chain_unittest/intermediate-unknown-non-critical-extension/generate-chains.py b/net/data/verify_certificate_chain_unittest/intermediate-unknown-non-critical-extension/generate-chains.py
index 108c9196fe2a9cebbdfdc228ada6318dcbd70084..4833c1b93909b485706588f58513aa14576f83da 100755
--- a/net/data/verify_certificate_chain_unittest/intermediate-unknown-non-critical-extension/generate-chains.py
+++ b/net/data/verify_certificate_chain_unittest/intermediate-unknown-non-critical-extension/generate-chains.py
@@ -3,17 +3,15 @@
 # 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
-has an unknown X.509v3 extension that is marked as non-critical. Verification
-is expected to succeed because although unrecognized, the extension is not
-critical."""
+"""Certificate chain where the intermediate contains an unknown non-critical
+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 = common.create_intermediate_certificate('Intermediate', root)