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

[Martin Panter]

Martin Panter added the comment:

“digits which do not form decimal radix forms”

I see you have taken this from a Unicode document, but “forming a form” seems a long way of saying very little. The difference seems a bit vague, but I gather that digits not in the Unicode “decimal digit” category are often (always?) still decimal digits, but primarily used for a symbolic or typographical meaning more than in a plain number, e.g. superscripts, subscripts and other fonts, added circles and other decorations.

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stage: needs patch -> patch review
versions: +Python 3.7

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