[docs] Doc for filterfalse is incorrect.

[Pinku Surana]

Here: https://docs.python.org/3/library/itertools.html

In the table, the row for describing filterfalse. The Results column
says "elements of seq where pred(elem) is false".

And here, for the full documentation:
https://docs.python.org/3/library/itertools.html#itertools.filterfalse

In both cases, it says the result contains the elements where the predicate
returns false. That's not true. It returns the elements where the predicate
returns True. It's the opposite of filter.
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