doc: Fix typos

Peter Eisentraut <peter_e@gmx.net>

Commit: 68f3dbc5525a7e78290f7dee8a74f66d5fa738d6
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2017-02-17T23:59:29Z
Releases: 10.0
doc: Fix typos

From: Thom Brown <thom@linux.com>

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