[docs] [issue25381] Doc: Use of old description of raise in Python3

[Xiang Zhang]

Xiang Zhang added the comment:

Actually what I intend is that the exception object passed to raise is the exception instance raise finally throws (what is stored in the second variable). So it seems wise not to do any more for me. A single sentence has lead to confusion, not to mention more.

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<http://bugs.python.org/issue25381>
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