[docs] [issue9637] docs do not say that urllib uses HTTP_PROXY

Kirikaza <kirikaza@rambler.ru> added the comment: I missed the print statement in that example... So I attached the file with correct code. ---------- Added file: http://bugs.python.org/file18594/proxy.py _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue9637> _______________________________________