[issue42169] Apparently all documentation on @typing.overload is wrong

[Ken Jin]

Change by Ken Jin <kenjin4096 at gmail.com>:


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nosy: +gvanrossum, kj, levkivskyi
versions:  -Python 3.6, Python 3.7

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue42169>
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