Fix typo in regression test comment

Andrew Dunstan <andrew@dunslane.net>

Commit: ef4583238b9ceaca728a27aea711a5f467dc49d5
Author: Andrew Dunstan <andrew@dunslane.net>
Date: 2018-10-24T23:40:58Z
Releases: 11.1
Fix typo in regression test comment

per Michael Banck

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