[docs] [issue8824] Improve documentation of exec

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

To be super-clear, consider adding one more sentence, something like

"The result for code with def statements or lambda expressions may be different than it would be if the implied context were a function rather than a class."

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