[docs] [issue35318] Check accuracy of str() doc string for its encoding argument

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

>>> str(buffer, errors='strict')
'lim x ⟶ ∞, 1/sin²(x)'

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nosy: +serhiy.storchaka

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35318>
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