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

[Mariatta Wijaya]

Mariatta Wijaya added the comment:

Patch has been applied to 3.7 and 3.6.
Thanks everyone :)

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resolution:  -> fixed
stage: backport needed -> resolved
status: open -> closed

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