Incorrect descriptions in Docstrings

[NimaSarajpoor]

I have been reading the module mpdist and I noticed:

• The description of the output of _mpdist_vect is missing from its docstring
• The description of μ_Q and σ_Q (in _mpdist_vect) are not correct. I think they should be numpy.ndarrays not float.
• The description of μ_Q and σ_Q (in core. _mass_distance_matrix) are not correct. I think they should be numpy.ndarrays not float.

[seanlaw]

Thanks for identifying this @NimaSarajpoor. I just took a look and I think you are correct. Would you mind submitting a PR to address this?

[NimaSarajpoor]

Sure, I will do so in a day or two.