[issue18335] Add textwrap.dedent, .indent, as str methods.

[Éric Araujo]

Éric Araujo added the comment:

IMO it’s fine that docstrings continue to live as pure string literals, and documentation tools continue to follow PEP 257’s advice.

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nosy: +eric.araujo

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<http://bugs.python.org/issue18335>
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