[issue8824] Improve documentation of exec

[Ezio Melotti]

Ezio Melotti <ezio.melotti at gmail.com> added the comment:

In 3.x exec is a function, so the reference to 'in' should be removed/updated.  On 2.x it might be better to just use ``in`` instead of :keyword:`in`, because the latter probably links to the 'in' operator that checks for containment.

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nosy: +ezio.melotti
stage:  -> patch review
versions: +Python 3.3 -Python 2.6

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