[issue37102] Automatically dedent docstring constants by default

[Inada Naoki]

Inada Naoki <songofacandy at gmail.com> added the comment:

How about do `inspect.cleandoc()` instead of just a dedent?
Some method has docstring like this:

    """First line

    blah blah blah blah

        example code here
    ...
    """

In such docstring, dedent can not strip indent well.

There is existing attempt (in Japanese):

https://qiita.com/hhatto/items/3da6c6820817395f2c39#%E6%84%9A%E7%9B%B4%E3%81%AB%E5%AE%9F%E8%A3%85%E3%81%97%E3%81%9F%E3%82%B3%E3%83%BC%E3%83%89

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nosy: +inada.naoki

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37102>
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