[docs] [issue17188] Document 'from None' in raise statement doc.

Mariatta Wijaya added the comment: New changeset 00b381b9a7b6b15350d1dcf7c688bf808cbf0ebb by Mariatta (csabella) in branch '3.6': bpo-17188: DOC: Document 'from None' in raise statement (GH-1671) (GH-1867) https://github.com/python/cpython/commit/00b381b9a7b6b15350d1dcf7c688bf808cb... ---------- _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue17188> _______________________________________