[docs] [issue8652] Minor improvements to the "Handling Exceptions" part of the tutorial

[Roundup Robot]

Roundup Robot <devnull at psf.upfronthosting.co.za> added the comment:

New changeset b873afe640e2 by R David Murray in branch '2.7':
#8652: update errors tutorial.
http://hg.python.org/cpython/rev/b873afe640e2

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nosy: +python-dev

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