[issue10587] Document the meaning of str methods

[Senthil Kumaran]

Senthil Kumaran <orsenthil at gmail.com> added the comment:

...
> redundant checks for isdecimal() and isdigit().  I think the
> documentation should reflect what the code does for an off-chance
> that someone would replace unicodedata with their own database with
> which these checks are not redundant.

+1 for making these changes. Helps clarify meaning of these methods with
respect to Unicode strings.

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nosy: +orsenthil

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<http://bugs.python.org/issue10587>
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