[docs] [issue26847] filter docs unclear wording

[Josh Rosenberg]

Josh Rosenberg added the comment:

"are equal to False" would be wrong though. Any "falsy" value is preserved by filterfalse, and removed by filter. They need not be equal to False (the bool singleton); empty containers (e.g. (), [], {}, "") are all considered false, and behave as such, despite not being equal to False.

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nosy: +josh.r

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