Fix mean_and_var and mean_and_std docstring signature

[bowenszhu]

The default value for the argument corrected in the docstring signature of mean_and_var and mean_and_std is false, but it is actually true in the code.

StatsBase.jl/src/moments.jl

Lines 153 to 165 in a0e6f1e

	"""
	mean_and_var(x, [w::AbstractWeights], [dim]; corrected=false) -> (mean, var)
	Return the mean and variance of a real-valued array `x`, optionally over a dimension
	`dim`, as a tuple. Observations in `x` can be weighted using weight vector `w`.
	Finally, bias correction is be applied to the variance calculation if `corrected=true`.
	See [`var`](@ref) documentation for more details.
	"""
	function mean_and_var(A::RealArray; corrected::Bool=true)
	m = mean(A)
	v = varm(A, m; corrected=corrected)
	m, v
	end

StatsBase.jl/src/moments.jl

Lines 167 to 180 in a0e6f1e

	"""
	mean_and_std(x, [w::AbstractWeights], [dim]; corrected=false) -> (mean, std)
	Return the mean and standard deviation of a real-valued array `x`, optionally
	over a dimension `dim`, as a tuple. A weighting vector `w` can be specified
	to weight the estimates. Finally, bias correction is applied to the
	standard deviation calculation if `corrected=true`.
	See [`std`](@ref) documentation for more details.
	"""
	function mean_and_std(A::RealArray; corrected::Bool=true)
	m = mean(A)
	s = stdm(A, m; corrected=corrected)
	m, s
	end

[nalimilan]

Thanks! The default was changed a long time ago and it looks like we missed some occurrences.