doc: Improve wording

Peter Eisentraut <peter_e@gmx.net>

Commit: 506652bcaea74a23d6f0a33923a7f558126b472d
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2018-03-03T14:56:17Z
Releases: 11.0
doc: Improve wording

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doc/src/sgml/bgworker.sgml modified +1 −1

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