doc: Clean up title case use

Peter Eisentraut <peter@eisentraut.org>

Commit: 46bbe5d777722938496f177706cc87ff64512def
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2021-07-01T19:27:39Z
Releases: 14.0
doc: Clean up title case use

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