[OO] Javadoc & readibility improvements #20650

Job	Run time
CHANGELOG.md	10s
CHANGELOG.md - only unreleased touched	15s
Checkstyle	2m 23s
Database tests	2m 38s
GUI tests	1m 47s
Markdown	7s
Modernizer	1m 21s
OpenRewrite	2m 19s
Unit tests	7m 25s
Code coverage	27s
Validate Gradle Wrapper	15s
Find merge conflicts	5s
Source branch is other than "main"	1s
upload-pr-number	4s
Validate requirement coverage	34s
	19m 51s

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