Unit

improve "render tree" case in docs #30538

Job	Run time
Smoke (latest, Phpunit)	28s
Smoke (latest, CodingStyle)	43s
Unit (7.4, Phpunit)	2m 3s
Docs	28s
Smoke (latest, StaticAnalysis)	44s
Unit (7.4, Phpunit Lowest)	2m 4s
Behat (8.1, Chrome)	5m 13s
Unit (8.0, Phpunit)	2m 12s
Behat (8.1, Chrome Lowest)	5m 14s
Unit (8.0, Phpunit Lowest)	2m 4s
Behat (8.2, Chrome)	5m 4s
Unit (8.1, Phpunit)	2m 2s
Behat (8.2, Chrome Lowest)	5m 41s
Unit (8.1, Phpunit Lowest)	2m 9s
Behat (8.3, Chrome)	5m 16s
Unit (8.2, Phpunit)	1m 58s
Behat (8.3, Chrome Lowest)	5m 20s
Unit (8.2, Phpunit Lowest)	2m 4s
Behat (latest, Firefox)	5m 43s
Unit (8.3, Phpunit)	2m 5s
Behat (latest, Chrome Slow)	9m 34s
Unit (8.3, Phpunit Lowest)	2m 5s
Behat (latest, Firefox Slow)	7m 47s
Unit (latest, Phpunit Burn)	5m 30s
	1h 23m 31s

Provide feedback