[docs] [issue27202] make doctest fails on 2.7 release notes

[Martin Panter]

Martin Panter added the comment:

Since I stuck my neck out, I will say that this seems reasonable to me. We could probably still run doctest in the actual 2.7 branch to detect any errors there.

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stage:  -> patch review
versions: +Python 3.5

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<http://bugs.python.org/issue27202>
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