[docs] [issue18548] In unittest doc change WidgetTestCase to SimpleWidgetTestCase in suite()

[Terry J. Reedy]

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


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nosy: +ezio.melotti, michael.foord
stage:  -> patch review
versions: +Python 3.3

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18548>
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