[UX] Refined dpct --help information format #6948

Job	Run time
clang-format	3m 5s
linux-build	32m 54s
linux-lit	57m 30s
linux-test-user_guide_samples-cpu	6m 54s
linux-test-regressions-cpu	6m 11s
linux-test-samples-cpu	5m 3s
linux-test-help_function-cpu	13m 1s
linux-test-features-usm-cpu	17m 12s
linux-test-features-usmnone-cpu	19m 44s
linux-test-api_coverage-cpu	6m 51s
linux-test-behavior_tests-cpu	7m 11s
	2h 55m 36s

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