Improve quoting in some error messages

Peter Eisentraut <peter@eisentraut.org>

Commit: 07e5e66742333ab100a557e6e3f710e92fa1fd92
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2021-04-14T07:11:29Z
Releases: 14.0
Improve quoting in some error messages

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