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

Mariatta Wijaya added the comment: New changeset 9efad1e5aef32a6d8ca288793e8ee6df8782f615 by Mariatta in branch 'master': bpo-17188: add missing periods at the end of sentences (GH-1875) https://github.com/python/cpython/commit/9efad1e5aef32a6d8ca288793e8ee6df878... ---------- _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue17188> _______________________________________