[docs] [issue8824] Improve documentation of exec

[Terry J. Reedy]

Terry J. Reedy added the comment:

I suggested more change here than I committed in #13557. I would like to think about the extra a bit more. The issue about def in exec just came up again on python-list, but I do not really like the third sentence I suggested.

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assignee: docs at python -> terry.reedy

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue8824>
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