[frontend] fix up a left over comment #6422

Job	Run time
pre-commit-arm64	56s
rust-checks-x86_64	3m 28s
rust-checks-arm64	2m 39s
rust-wasm-build-arm64	1m 18s
rust-wasm-build-x86_64	1m 25s
rust-test-x86_64	5m 24s
rust-test-arm64	4m 5s
circuits-snapshot (sha512)	2m 47s
rust-test-all-features-x86_64	6m 41s
rust-doc	1m 11s
circuits-snapshot (hash_based_sig)	2m 52s
circuits-snapshot (ethsign)	3m 0s
circuits-snapshot (zklogin)	2m 58s
rust-test-all-features-arm64	4m 37s
circuits-snapshot (keccak)	2m 47s
pre-commit-x86_64	1m 0s
circuits-snapshot (sha256)	2m 51s
circuits-snapshot (blake2s)	2m 48s
	52m 47s

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