[docs] [issue26462] Patch to enhance literal block language declaration

[Julien]

Julien added the comment:

Martin: OK, let's apply this to 3.6 / 3.5 with this one, and I'll provide independent patch for 2.7 if needed (long time without building 2.7 doc).

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