[chore][docs] Use consistent title hierarchy #31433

Job	Run time
contrib-tests-matrix (receiver-0)	6m 42s
contrib-tests-matrix (receiver-1)	8m 29s
contrib-tests-matrix (receiver-2)	8m 46s
contrib-tests-matrix (receiver-3)	7m 37s
contrib-tests-matrix (processor)	7m 0s
contrib-tests-matrix (exporter-0)	3m 31s
contrib-tests-matrix (exporter-1)	10m 25s
contrib-tests-matrix (extension)	6m 45s
contrib-tests-matrix (connector)	5m 5s
contrib-tests-matrix (internal)	7m 52s
contrib-tests-matrix (pkg)	4m 18s
contrib-tests-matrix (cmd-0)	47s
contrib-tests-matrix (cmd-1)	1m 20s
contrib-tests-matrix (other)	4m 44s
contrib_tests	1s
	1h 23m 22s

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