Fix some trailing whitespace in documentation files

Peter Eisentraut <peter@eisentraut.org>

Commit: 197d33ccbe888fc84ae4e49bb241e88ea3c81f15
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2021-04-22T20:47:57Z
Releases: 14.0
Fix some trailing whitespace in documentation files

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Documentation touched