doc: Clean up title case use

Peter Eisentraut <peter@eisentraut.org>

Commit: c0fdc963704983ebd5908dc5acfb4d52303091a4
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2021-07-01T19:29:34Z
Releases: 15.0
doc: Clean up title case use

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