Fix wording of copyright notice for fix_input_six.py.

Signed-off-by: Daira Hopwood <[email protected]>

Author: daira

libmodernize/fixes/fix_input_six.py

@@ -1,14 +1,12 @@
 # This is a derived work of Lib/lib2to3/fixes/fix_input.py and
-# Lib/lib2to3/fixes/fix_raw_input.py under the
-# copyright of the Python Software Foundation, licensed under the Python
-# Software Foundation License 2.
+# Lib/lib2to3/fixes/fix_raw_input.py. Those files are under the
+# copyright of the Python Software Foundation and licensed under the
+# Python Software Foundation License 2.
 #
 # Copyright notice:
 #
 #     Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
 #     2011, 2012, 2013, 2014 Python Software Foundation. All rights reserved.
-#
-# Full license text: http://docs.python.org/3.4/license.html
 
 from lib2to3 import fixer_base
 from lib2to3.fixer_util import Call, Name, touch_import