update docstring

Lib/unittest.py

@@ -25,9 +25,10 @@ Simple usage:
 
 Further information is available in the bundled documentation, and from
 
-  http://docs.python.org/lib/module-unittest.html
+  http://docs.python.org/library/unittest.html
 
 Copyright (c) 1999-2003 Steve Purcell
+Copyright (c) 2003-2009 Python Software Foundation
 This module is free software, and you may redistribute it and/or modify
 it under the same terms as Python itself, so long as this copyright message
 and disclaimer are retained in their original form.