[issue26847] filter docs unclear wording

[Luke]

Luke added the comment:

For shame! ... I deserved that callout. :S

My examples should have included the cast to bool, which is indeed not the same as the values' being "equal to False" in themselves...

I didn't realize that "is false" was conventional shorthand for that cast and comparison. Thanks!

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue26847>
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