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

[Thomi Richards]

Thomi Richards added the comment:

I have attached a patch for 3.4, based on the patch submitted by Nitika Agarwal. The main difference is that I think it's better to be explicit and show a separate example of `raise X from None`.

I will submit a patch for later versions as well.

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nosy: +thomir
Added file: http://bugs.python.org/file44607/issue17188_3.4.patch

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