[docs] [issue16574] clarify policy on updates to final peps

Chris Jerdonek added the comment: By the way, I don't especially care if the clarification goes in the PEP itself or not. What's more important is that it be documented *somewhere* (which could also be the devguide, for example). My interest in knowing the process is genuine. ---------- _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue16574> _______________________________________