Add doc hit for as_completed().update(futures) (#6817)
Add doc hit for as_completed().update(futures) (#6817)

* Add doc hit for as_completed().update(futures)

* Correct markdown syntax

Co-authored-by: James Bourbeau <d47a96e8b557881d8d6a5263afaffb9cba464dc8@users.noreply.github.com>

Co-authored-by: James Bourbeau <d47a96e8b557881d8d6a5263afaffb9cba464dc8@users.noreply.github.com>
dask/dask,jakirkham/dask,blaze/dask,blaze/dask,dask/dask,jakirkham/dask