[docs] [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 another edit pass, incorporating Éric's suggestions and adding some additional tweaks.  In particular, I eliminated the anti-pattern of catching (IOError, OSError) in one of the earlier examples in favor of the correct EnvironmentError, and also improved the error message generated in that case :)

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Added file: http://bugs.python.org/file18843/doanddont-except.patch

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