Docs: Update support.rst [skip ci] (#4097)
Docs: Update support.rst [skip ci] (#4097)

This PR updates `support.rst` with minor rectifications and improvements to punctuation and a couple of wording improvements.
blaze/dask,ContinuumIO/dask,dask/dask,mrocklin/dask,blaze/dask,jakirkham/dask,ContinuumIO/dask,dask/dask,jcrist/dask,jcrist/dask,jakirkham/dask,mrocklin/dask