remove camelcase in `rand(W::Haar, n::Int, doCorrection::Int = 1)`

Could probably just do `correct::Int = 1` instead. This should be a kwarg rather than an optional argument too.

Start at the `rand(W::Haar, n::Int, doCorrection::Int = 1)` entry point and inspect its surrounding method definition and call sites. Update the argument naming and argument style as requested, then verify that existing uses still work and the public signature reflects the intended keyword argument.

索引モデルが issue の本文から書いたものです。