[docs] [issue15221] os.path.is*() may return False if path can't be accessed

[Cheryl Sabella]

Cheryl Sabella <chekat2 at gmail.com> added the comment:

I created a PR for this by making the word 'existing' a link to 'os.path.exists' since Nick mentioned that that word already implied the definition.

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nosy: +csabella
versions: +Python 3.7 -Python 2.7, Python 3.2, Python 3.3

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<https://bugs.python.org/issue15221>
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