MNT: Fix a couple docstring typos.
MNT: Fix a couple docstring typos.

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