[docs] [issue29274] Change “tests cases” → “test cases”

[Roundup Robot]

Roundup Robot added the comment:

New changeset f2fe00653d07 by Martin Panter in branch '3.5':
Issue #29274: tests cases → test cases
https://hg.python.org/cpython/rev/f2fe00653d07

New changeset 145da99b3df2 by Martin Panter in branch '3.6':
Issue 29274: Merge doc fixes from 3.5
https://hg.python.org/cpython/rev/145da99b3df2

New changeset f093f88f8a5c by Martin Panter in branch 'default':
Issue 29274: Merge doc fixes from 3.6
https://hg.python.org/cpython/rev/f093f88f8a5c

New changeset 9b22d52a6d4b by Martin Panter in branch '2.7':
Issue #29274: tests cases → test cases
https://hg.python.org/cpython/rev/9b22d52a6d4b

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nosy: +python-dev

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<http://bugs.python.org/issue29274>
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