[docs] No shlex.join() docs in 3.8?

Hi, I noticed the "What's New in Python 3.8" doc lists a new shlex.join() method, but it seems there are no relevant docs for it under the shlex module's doc. https://docs.python.org/3/library/shlex.html#shlex.join Excited to try out 3.8! Thanks for all the hard work. Best, Avy *Avy Faingezicht* www.faingezicht.com