Docs: Update delayed-best-practices.rst (#4254)
Docs: Update delayed-best-practices.rst (#4254)

This PR updates `delayed-best-practices.rst` with some corrections to punctuation and naming conventions. Additionally, a few words have been added to a couple of sentences to improve clarity.
ContinuumIO/dask,jcrist/dask,dask/dask,mrocklin/dask,jakirkham/dask,mrocklin/dask,blaze/dask,dask/dask,jcrist/dask,jakirkham/dask,blaze/dask,ContinuumIO/dask