[docs] [issue30872] Update curses docs to Python 3

[Serhiy Storchaka]

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


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resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed
versions:  -Python 3.5

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue30872>
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