doc: Remove some trailing whitespace

Peter Eisentraut <peter_e@gmx.net>

Commit: b645a05fc6112a4857ceac574d4aa24174a70417
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2016-12-17T14:35:31Z
Releases: 10.0
doc: Remove some trailing whitespace

Per discussion, we will not at this time remove trailing whitespace in
psql output displays where it is part of the actual psql output.

From: Vladimir Rusinov <vrusinov@google.com>

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