Fix the help of --asm-rewriting-pipeline #941

Job	Run time
docker-master	1h 31m 41s
test-standalone (master, dev, default)	1m 44s
publish-standalone-dry-run	19s
validate-docker-master	2m 28s
build-js-of-ocaml (master, 4.11.1)	6m 17s
build-wasm-of-ocaml (master, 4.14.1)	19m 26s
test-amd64	2h 18m 10s
standalone-haskell (master)	49m 59s
generated-files (master)	23m 12s
deploy-js-wasm-of-ocaml	1m 29s
docker-check-all	3s
	5h 34m 48s

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