[docs] [issue17109] unittest.mock has wrong heading levels

[Roundup Robot]

Roundup Robot added the comment:

New changeset 9040b3714207 by Georg Brandl in branch '3.3':
#17109: fix headings in mock example doc.
http://hg.python.org/cpython/rev/9040b3714207

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17109>
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