doc: Fix whitespace

Peter Eisentraut <peter@eisentraut.org>

Commit: 122fa9f942478f8fdcfba961e01d172574369293
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2019-04-08T20:32:46Z
Releases: 12.0
doc: Fix whitespace

Author: Julien Rouhaud <rjuju123@gmail.com>

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