Fix some typos in regression test comments.

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

Commit: 551654977022097ac408b483b3be9887a99f0ce0
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2015-07-05T17:14:38Z
Releases: 9.6.0
Fix some typos in regression test comments.

Back-patch to avoid unnecessary cross-branch differences.

CharSyam

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