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

[Berker Peksag]

Berker Peksag added the comment:

Thanks for the patch. Two things:

* We want to keep docstrings short so could you please revert the changes in Lib/configparser.py?

* It would be better to just add an example of escaping these characters in the "Interpolation of values" section (preferably with a short comment.)

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nosy: +berker.peksag
stage:  -> patch review
versions: +Python 3.6

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