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

[Nitika Agarwal]

Nitika Agarwal added the comment:

Hi,
As suggested by Petri,I have made some changes.
Please review the attached patch.Any comments and feedback are welcome.

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nosy: +nitika
Added file: http://bugs.python.org/file34431/issue17188.patch

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