[docs] [issue11468] Improve unittest basic example in the doc

[Ezio Melotti]

Ezio Melotti added the comment:

I tweaked the wording a bit, added a link to the section about setUp/tearDown, and applied it on all the 3 branches.
Thanks for the patch Florian!

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resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed

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<http://bugs.python.org/issue11468>
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