[issue11090] Doc errors for unittest in Python 3.1

[Éric Araujo]

Éric Araujo <merwok at netwok.org> added the comment:

It looks like the doc snippets are actually new in 3.1, so we should not remove them but just fix the versionadded.

The change I wrongly added is the part about command-line use.  That can go.

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