[docs] [issue16701] Docs missing the behavior of += (in-place add) for lists.

Martin Panter added the comment: “For the most part” works for me. Here is the patch. ---------- Added file: http://bugs.python.org/file40637/seq-inplace.v3.patch _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue16701> _______________________________________