[docs] [issue21562] curses getsxy() should be curses getxy() in https://docs.python.org/3/library/curses.html#curses.cursxy

[Ned Deily]

Changes by Ned Deily <nad at acm.org>:


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keywords: +easy
versions: +Python 3.5

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21562>
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