doc: Fix typos and other minor issues

Peter Eisentraut <peter_e@gmx.net>

Commit: c6a7fcb49a60081c04c8e421fbc21475ad6943d8
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2017-09-02T03:34:03Z
Releases: 10.0
doc: Fix typos and other minor issues

Author: Alexander Lakhin <exclusion@gmail.com>

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