Merge spelling and grammar fixes from 3.5

diff --cc Include/unicodeobject.h
Simple merge

diff --cc Lib/test/test_cmd_line.py
Simple merge

diff --cc Lib/test/test_socket.py
Simple merge

diff --cc Lib/threading.py
Simple merge

diff --cc Lib/tkinter/ttk.py
Simple merge

diff --cc Misc/NEWS
Simple merge

diff --cc Misc/coverity_model.c
Simple merge

diff --cc Objects/odictobject.c
Simple merge

diff --cc Objects/typeobject.c
Simple merge

diff --cc Python/ast.c
Simple merge

diff --cc Tools/i18n/pygettext.py
Simple merge