Clarify dask.visualize docstring (#8710)
Clarify dask.visualize docstring (#8710)

Co-authored-by: Jim Crist-Harif <ece95c7b5887911f400f9e2406868b8d66342673@gmail.com>
dask/dask,jakirkham/dask,jakirkham/dask,dask/dask