Fix typo in regression test comment

Andrew Dunstan <andrew@dunslane.net>

Commit: 4beea5508e80a65a90f3fa857ea34ec71b9d6db2
Author: Andrew Dunstan <andrew@dunslane.net>
Date: 2018-10-24T23:39:50Z
Releases: 12.0
Fix typo in regression test comment

per Michael Banck

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