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

[Mariatta Wijaya]

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/9efad1e5aef32a6d8ca288793e8ee6df8782f615


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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17188>
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