A couple of minor fixes
This MR just fixes a small bit of doc string that was accidentally removed in !110 (merged), and makes the MultivariateNormalDist a proper child of the MultivariateGaussianDist class.
This MR just fixes a small bit of doc string that was accidentally removed in !110 (merged), and makes the MultivariateNormalDist a proper child of the MultivariateGaussianDist class.