Merge Misc/NEWS fixes from 3.2.
Fix docstring typo in concurrent.futures.Future
Fix a few typos in Misc/NEWS.
remove unnecessary clearing of list
Remove cruft and circumvolutions from the unittest docs.
(I would have preferred to post this for review but the bug tracker is pretty much dead at the moment)
Touch correct file in 'make touch'
#4153: update the Unicode howto.
#4153: merge with 3.2.