[docs] [issue27635] pickle documentation says that unpickling may not call __new__

[Serhiy Storchaka]

Changes by Serhiy Storchaka <storchaka+cpython at gmail.com>:


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nosy: +alexandre.vassalotti, serhiy.storchaka
stage:  -> needs patch
type:  -> behavior
versions: +Python 3.7 -Python 3.4

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<http://bugs.python.org/issue27635>
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