Tweak description comments in tests for partition functions

Michael Paquier <michael@paquier.xyz>

Commit: 3e514c1238312c56b73d956d844c67a034dead02
Author: Michael Paquier <michael@paquier.xyz>
Date: 2018-12-18T01:52:21Z
Releases: 12.0
Tweak description comments in tests for partition functions

The new wording is more generic and fixes one grammar mistake and one
typo on the way.

Per discussion between Amit Langote and me.

Discussion: https://postgr.es/m/20181217064028.GJ31474@paquier.xyz

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Discussion