Fix Latin spelling

Peter Eisentraut <peter_e@gmx.net>

Commit: 9e945f862633882cae3183d465f321bd8dd591f9
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2018-01-11T13:32:01Z
Releases: 11.0
Fix Latin spelling

"c.f." should be "cf.".

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