[docs] [issue26483] docs unclear on difference between str.isdigit() and str.isdecimal()

[Terry J. Reedy]

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


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nosy: +terry.reedy
versions:  -Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue26483>
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