[docs] [issue21018] [patch] added missing documentation about escaping characters for configparser

[Cheryl Sabella]

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

@Arun.Persaud, would you be interested in converting your patch to a Github pull request?

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nosy: +csabella
versions: +Python 3.7, Python 3.8 -Python 3.5

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<https://bugs.python.org/issue21018>
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