Update onc_spec.html to match implementation.

chromeos/network/onc/onc_validator.cc

Index: chromeos/network/onc/onc_validator.cc
diff --git a/chromeos/network/onc/onc_validator.cc b/chromeos/network/onc/onc_validator.cc
index 54cb8eddc5f36e86c9011ea7ea26b735bb52790f..f4bec524d5a82f4bace3b02875b50de500b9e74c 100644
--- a/chromeos/network/onc/onc_validator.cc
+++ b/chromeos/network/onc/onc_validator.cc
@@ -431,12 +431,6 @@ bool Validator::ValidateToplevelConfiguration(base::DictionaryValue* result) {
   if (FieldExistsAndHasNoValidValue(*result, kType, valid_types))
     return false;
 
-  // Not part of the ONC spec:
-  // - We don't require the type field (we assume that it's an
-  //   UnencryptedConfiguration then).
-  // - We don't require specific toplevel objects to be present (e.g. at least
-  //   one of NetworkConfiguration or Certificates).
-
   if (IsGlobalNetworkConfigInUserImport(*result))
     return false;