[docs] [issue22822] IPv6Network constructor docs incorrect about valid input

[Xiang Zhang]

Change by Xiang Zhang <angwerzx at 126.com>:


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resolution:  -> duplicate
stage:  -> resolved
status: open -> closed
superseder:  -> ipaddress documentation errors

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue22822>
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