Make spelling of "acknowledgment" consistent

Peter Eisentraut <peter_e@gmx.net>

Commit: 35584fd05f9b104f057c700360985991f111a847
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2018-10-15T08:06:45Z
Releases: 12.0
Make spelling of "acknowledgment" consistent

I used the preferred U.S. spelling, as we do in other cases.

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