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

[Terry J. Reedy]

Terry J. Reedy added the comment:


New changeset 763557eac06ba60d7c5133e4f80df8870d8f917e by terryjreedy (csabella) in branch 'master':
bpo-17188: DOC: Document 'from None' in raise statement (#1671)
https://github.com/python/cpython/commit/763557eac06ba60d7c5133e4f80df8870d8f917e


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