Docs: Update debugging.rst (#4279)
Docs: Update debugging.rst (#4279)

This PR updates `debugging.rst` with punctuation, naming conventions, and typo corrections, plus a couple of rewording os some sentences has been used to improve clarity.
jakirkham/dask,ContinuumIO/dask,blaze/dask,ContinuumIO/dask,mrocklin/dask,jcrist/dask,blaze/dask,jakirkham/dask,dask/dask,jcrist/dask,mrocklin/dask,dask/dask