reduce the size of example dataset in dask docs (#3187)
reduce the size of example dataset in dask docs (#3187)


jhamman/xarray,pydata/xarray,markelg/xray,pydata/xarray,jhamman/xray,pydata/xarray,jhamman/xarray,markelg/xray,jhamman/xarray,xray/xray,shoyer/xarray,markelg/xray,shoyer/xarray