doc: Fix typos and other minor issues

Peter Eisentraut <peter_e@gmx.net>

Commit: afc58affb6616a415ea991763e0383832346e7c7
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2017-09-02T03:34:12Z
Releases: 11.0
doc: Fix typos and other minor issues

Author: Alexander Lakhin <exclusion@gmail.com>

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