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

[Roundup Robot]

Roundup Robot added the comment:

New changeset 4a2a5fddbab3 by Ezio Melotti in branch '2.7':
#11468: improve unittest basic example.  Initial patch by Florian Preinstorfer.
https://hg.python.org/cpython/rev/4a2a5fddbab3

New changeset 010e33b37feb by Ezio Melotti in branch '3.4':
#11468: improve unittest basic example.  Initial patch by Florian Preinstorfer.
https://hg.python.org/cpython/rev/010e33b37feb

New changeset d6791e4026f1 by Ezio Melotti in branch 'default':
#11468: merge with 3.4.
https://hg.python.org/cpython/rev/d6791e4026f1

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nosy: +python-dev

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