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

[Ulf Rompe]

Change by Ulf Rompe <ulf at rompe.org>:


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pull_requests: +14564
pull_request: https://github.com/python/cpython/pull/14771

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue25433>
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