[docs] [issue28315] incorrect "in ?" output in 'divide' example at "Defining Clean-up Actions" in tutorial

[Terry J. Reedy]

Changes by Terry J. Reedy <tjreedy at udel.edu>:


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assignee: docs at python -> terry.reedy
nosy: +terry.reedy
stage:  -> commit review
versions: +Python 3.6, Python 3.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28315>
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