[issue9608] Re-phrase best way of using exceptions in doanddont.rst

[R. David Murray]

R. David Murray <rdmurray at bitdance.com> added the comment:

Here is a more extensive rewrite that I think makes things clearer and (I hope) makes the text read better.  I also updated the preceding section per the confusion expressed in issue 8518.

Note that this patch is somewhat Python3 specific, since it assumes that all non-BaseException exceptions inherit from Exception.  If someone wants to backport it to 2.7 a paragraph or footnote should be added about that problem.

Opinions welcome.

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nosy: +r.david.murray
Added file: http://bugs.python.org/file18791/doanddont-except.patch

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