[docs] Logic operators description not general.

[Sigurd Meldgaard]

Both on
https://docs.python.org/2/library/stdtypes.html
https://docs.python.org/3/library/stdtypes.html

in the part: 4.2. Boolean Operations — and, or, not
Says: This is a short-circuit operator, so it only evaluates the second
argument if the first one is False.
And several similar formulations.

It would be more correct to say:
This is a short-circuit operator, so it only evaluates the second argument
if the first one tests to a false value.

Thanks
Sigurd
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