They aren't all my words, but most of them are :).

#17741

#16464, #17485, #17272.

Also tweaked the docs a bit to use our standard style for
versionadded/changed.  (I'm guessing there are other places
in the multiprocessing docs where similar tweaks should be made.)

And missing NEWS entry.

Also cleaned up the email section and fixed some markup bugs in the
email docs.

And NEWS entry.

it clear that any Python 3.x is not usable with the checked out Sphinx.

Patch by Priya Pappachan, based on suggestions from Terry Reedy
and myself.

Patch by Claudiu Popa.