Fix some typos in regression test comments.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 486d3a2bb4b9e4c1cc64241f4b36643a22da8693
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2015-07-05T17:14:45Z
Releases: 9.5.0
Fix some typos in regression test comments.

Back-patch to avoid unnecessary cross-branch differences.

CharSyam

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