[docs] [issue25432] isinstance documentation: explain behavior when type is a tuple

[R. David Murray]

R. David Murray added the comment:

The fact that nested tuples are accepted is just bizarre, IMO :(.

It could say something like "If classinfo is a (possibly nested) list of types, return True if any of the types match."

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue25432>
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