Patch by Anastasia Filatova.

Patch by Tshepang Lekhonkhobe, reviewed by Georg Brandl.

Patch by Sean Rodman.

Thanks to Amaury Forgeot d’Arc and Philip J. Eby.

Corrections from Jim Jewett in #19861.

Patch by Lita Cho.

#19861 msg213159

#19861 msg213156.

Removed an entry made redundant by the new security section,
Moved 'marshal' to the section on features other platforms
will need to support, and mention that 'help' is improved
by the inspect/pydoc changes (#19561 msg213153).

in ipaddress.

Can't figure out what the other issue was for the importlib
changes.  Did find a small typo in the reload doc, though.

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.)

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