gh-95415: Make availability directive consistent (GH-95416)

Doc/library/_thread.rst

Doc/library/codecs.rst

Doc/library/crypt.rst

Doc/library/intro.rst

Doc/library/os.rst

Doc/library/pipes.rst

Doc/library/resource.rst

Doc/library/signal.rst

Doc/library/socket.rst

Doc/library/ssl.rst

Doc/library/subprocess.rst

Doc/library/sys.rst

Doc/library/threading.rst

Doc/library/time.rst

Doc/tools/extensions/pyspecific.py

Doc/using/cmdline.rst

...cumentation/2022-07-29-09-04-02.gh-issue-95415.LKTyw6.rst