Fix invert docstring (#4131)
Fix invert docstring (#4131)


mrocklin/dask,jakirkham/dask,dask/dask,blaze/dask,dask/dask,jcrist/dask,jakirkham/dask,mrocklin/dask,blaze/dask,jcrist/dask,ContinuumIO/dask,ContinuumIO/dask