Fixing typos in tests of partition_info.sql

[Michael Paquier]

Hi Amit,
(CC: -hackers)

I was just going through some of the tests, when I noticed that the
tests of partition_info.sql have two typos and that the last set of
tests is imprecise about the expected behavior of the functions.

Do you think that something like the attached is an improvement?

Thanks,
--
Michael

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