[docs] [issue25433] whitespace in strip()/lstrip()/rstrip()

[Ezio Melotti]

Changes by Ezio Melotti <ezio.melotti at gmail.com>:


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keywords: +easy
nosy: +ezio.melotti
stage:  -> needs patch
versions: +Python 3.6

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<http://bugs.python.org/issue25433>
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