parameter name 'expected_elements' may be ambiguous in with_properties_xx api

[virusdefender]

For example, in the CuckooFilter with_properties_4 API, the actual slot number is four times the value of expected_elements, meaning it can actually store four times the capacity, which could result in significantly higher memory usage than expected.

[crepererum]

Fair. I think we can change that for a breaking change. Feel free to file a PR if you like 🙂