Fix formatting issue in README.md #2

Job	Run time
MetaX tests / checkout_and_config	4s
CUDA tests	0s
MetaX tests / cli_validation / functional_test_cli	1m 38s
check_docker_changes	-9s
MetaX tests / unit_tests	0s
MetaX tests / all_tests_complete	3s
MetaX tests / functional_tests_serve	0s
MetaX tests / functional_tests_inference	0s
MetaX tests / functional_tests_hetero_train	0s
MetaX tests / functional_tests_train	0s
MetaX tests / functional_tests_benchmark	0s
all_tests	4s
	1m 40s

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