[docs] [issue29784] Erroneous link in shutil.copy description

[Xiang Zhang]

Xiang Zhang added the comment:

Thanks for your report, Maxime! I open PRs to fix it.

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nosy: +xiang.zhang
versions: +Python 3.5, Python 3.6, Python 3.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29784>
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