Update documentation in wrapper script to match the changed behavior in install-debian.wheezy.sysro…

build/linux/install-debian.wheezy.sysroot.wrapper.py

 #!/usr/bin/env python
 # Copyright (c) 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # This wrapper script runs the Debian sysroot installation scripts, if they
 # exist.
 #
 # The script is a no-op except for linux users who have the following in their
 # GYP_DEFINES:
 #
 # * branding=Chrome
 # * buildtype=Official
-# * target_arch=[matching_arch]
 #
 # and not:
 #
 # * chromeos=1
 
 import os.path
 import subprocess
 import sys
 
 def main():
@@ skipping 13 matching lines @@
     ret = subprocess.call([SCRIPT_FILE, '--linux-only', '--arch=amd64'])
     if ret != 0:
       return ret
     ret  = subprocess.call([SCRIPT_FILE, '--linux-only', '--arch=i386'])
     if ret != 0:
       return ret
   return 0
 
 if __name__ == '__main__':
   sys.exit(main())