Fix simple typo: wihout -> without (#5708)
Fix simple typo: wihout -> without (#5708)

Closes #5707
jakirkham/dask,mrocklin/dask,blaze/dask,ContinuumIO/dask,dask/dask,ContinuumIO/dask,dask/dask,mrocklin/dask,blaze/dask,jakirkham/dask