Fix typos in regression test comments.

Etsuro Fujita <efujita@postgresql.org>

Commit: 8ff5de1c7aa2439ae69f53efd61390026505aee4
Author: Etsuro Fujita <efujita@postgresql.org>
Date: 2019-08-29T09:45:01Z
Releases: 12.0
Fix typos in regression test comments.

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