[issue26462] Patch to enhance literal block language declaration

[Julien]

Julien added the comment:

@martin I reviewed my changes on `decimal.rst` and I now just fixing the indentation problem, so I don't change anything unrealated to fixing warnings, and don't break doctests.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue26462>
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