[docs] [issue27000] improve document of filter

[R. David Murray]

R. David Murray added the comment:

Thanks for wanting to improve the docs, but the docs are a specification of syntax and behavior, not of implementation.  So, the existing docs are correct, and changing them would over-specify the function.  Since Raymond has also voted for rejection, I'm closing this.

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nosy: +r.david.murray
resolution:  -> not a bug
stage:  -> resolved
status: open -> closed

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