Issue #26304: Merge doc wording from 3.5

diff --cc Doc/c-api/arg.rst
Simple merge

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

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

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

diff --cc Misc/NEWS
Simple merge

diff --cc Modules/_ctypes/_ctypes.c
Simple merge