rtx

shell: fixed --help flag, added "s" alias #2887

Job	Run time
build-aarch64-unknown-linux-gnu	8m 44s
coverage-0	5m 27s
build-x86_64-unknown-linux-gnu	5m 44s
unit	1m 10s
coverage-1	2m 26s
build-x86_64-apple-darwin	9m 41s
coverage-2	14m 9s
build-aarch64-apple-darwin	9m 46s
coverage-3	9m 50s
e2e-linux	0s
rpm	0s
deb	0s
release	0s
bump-alpine	0s
bump-homebrew-formula	0s
	1h 6m 57s

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