Add missing serial commas

Peter Eisentraut <peter_e@gmx.net>

Commit: d38228fe4029cce3af396bf5b1728d8000ab32c8
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2014-07-15T12:31:50Z
Releases: 9.5.0
Add missing serial commas

Also update one place where the wal_level "logical" was not added to an
error message.

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