[docs] a missed closing parenthesis

[tomo cocoa]

Hello,

I am a Japanese translator on Python documents , cocoatomo.

http://docs.python.org/3.3/distutils/apiref.html#distutils.dir_util.copy_tree

The third paragraph may miss a closing parenthesis just after a word "page".

Thanks,

cocoatomo

-- 
class Cocoatomo:
    name = 'cocoatomo'
    email_address = 'cocoatomo77 at gmail.com'
    twitter_id = '@cocoatomo'
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