[issue8824] Improve documentation of exec

[Terry J. Reedy]

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

I decided that the alternate addition in #13557 is enough.

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resolution:  -> out of date
stage: patch review -> resolved
status: open -> closed
versions:  -Python 2.7

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<https://bugs.python.org/issue8824>
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