Issue #23921: Standardized documentation whitespace formatting.

Doc/distutils/apiref.rst

Doc/faq/design.rst

Doc/faq/library.rst

Doc/faq/programming.rst

Doc/howto/descriptor.rst

Doc/howto/functional.rst

Doc/howto/logging-cookbook.rst

Doc/howto/logging.rst

Doc/howto/regex.rst

Doc/howto/unicode.rst

Doc/howto/urllib2.rst

Doc/library/argparse.rst

Doc/library/asynchat.rst

Doc/library/asyncio-sync.rst

Doc/library/asyncore.rst

Doc/library/audioop.rst

Doc/library/collections.abc.rst

Doc/library/collections.rst

Doc/library/concurrent.futures.rst

Doc/library/configparser.rst