standardize file style

Minor fixups:
 - don't use shebangs on non-executable files
 - drop +x from files that don't need it
 - fix blank line spacing
 - fix typos in a few module docstrings

BUG=chromium:414895
TEST=`./cbuildbot/run_tests` passes

Change-Id: Idbce70b406254fbfcd5efa4beff2b1d5aa058d11
Reviewed-on: https://chromium-review.googlesource.com/218571
Reviewed-by: David James <davidjames@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
diff --git a/scripts/cros_setup_toolchains.py b/scripts/cros_setup_toolchains.py
index 37809e3..d426b7d 100644
--- a/scripts/cros_setup_toolchains.py
+++ b/scripts/cros_setup_toolchains.py
@@ -1,10 +1,8 @@
-#!/usr/bin/env python
 # Copyright (c) 2012 The Chromium OS 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 script manages the installed toolchains in the chroot.
-"""
+"""This script manages the installed toolchains in the chroot."""
 
 import copy
 import glob