[docs] [issue28986] Docs should say set.update takes iterable

R. David Murray added the comment: update([iterable]) is a specific case of update(*others). udpate([1, 2], [3, 4]) is another specific case. ---------- nosy: +r.david.murray _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue28986> _______________________________________