MNT: Clean up docstrings.
MNT: Clean up docstrings.

This is mainly replacing array_like in parameter documentation with
pint.Quantity, since that's accurate. It also cleans up a bunch of
PyCharm typing messages.

dopplershift/MetPy,ahaberlie/MetPy,Unidata/MetPy,ahill818/MetPy,jrleeman/MetPy,dopplershift/MetPy,ahaberlie/MetPy,ShawnMurd/MetPy,Unidata/MetPy,jrleeman/MetPy