doc: Fix quoting markup

Peter Eisentraut <peter@eisentraut.org>

Commit: 903d9aa7801e3198ca24e90be805362ad11b6ec3
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2021-07-05T06:26:00Z
Releases: 15.0
doc: Fix quoting markup

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