[docs] [issue20003] Language Ref "raise" doc misssing "from None"

[Terry J. Reedy]

Changes by Terry J. Reedy <tjreedy at udel.edu>:


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resolution:  -> duplicate
stage:  -> committed/rejected
status: open -> closed
superseder:  -> Document 'from None' in raise statement doc.
type:  -> enhancement

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20003>
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