Clarify wind_components docstring and close #969
Clarify wind_components docstring and close #969

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