Update engine configuration documentation. #9354

Job	Run time
base-tests (./cli)	2m 50s
examples-rl (e10_drive)	5m 44s
benchmark (e10_drive)	2m 5s
examples-rl (e11_platoon)	3m 8s
benchmark (e11_platoon)	2m 0s
base-tests (./envision)	3m 32s
base-tests (./smarts/core --nb-exec-timeout 65536 --ignore=./smarts/core/tests/test_notebook.py)	3m 32s
base-tests (./smarts/env --ignore=./smarts/env/tests/test_rllib_hiway_env.py)	3m 34s
base-tests (./smarts/env/tests/test_rllib_hiway_env.py)	3m 6s
base-tests (./smarts/sstudio)	3m 25s
base-tests (./smarts/ray)	3m 20s
base-tests (./examples/tests/test_examples.py)	3m 32s
	39m 48s

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