Remove some trailing whitespace in documentation files

Peter Eisentraut <peter@eisentraut.org>

Commit: c9cfc861fc871014f9f2fce477c8182fa13fc120
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2022-01-27T17:31:01Z
Releases: 15.0
Remove some trailing whitespace in documentation files

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Documentation touched