[docs] [issue40561] Provide docstrings for public-facing webbrowser functions

Terry J. Reedy <tjreedy@udel.edu> added the comment: I just got my development machine back, so I will handle this. I first determined that code and doc are same in all 3 versions (except for audit event bit, which I am willing to leave out). ---------- versions: +Python 3.7 _______________________________________ Python tracker <report@bugs.python.org> <https://bugs.python.org/issue40561> _______________________________________