Fix comment in revert_arc #71

Job	Run time
stylecheck	22s
build-debug	14m 57s
build-arch (all)	14m 21s
build (ubuntu:focal, g++, gcc, all)	15m 33s
build-arch (horizon.so)	4m 28s
build-opensuse (all)	13m 2s
build (ubuntu:focal, g++, gcc, horizon.so)	5m 12s
build-pr-review	3m 32s
build-opensuse (horizon.so)	4m 31s
build (ubuntu:jammy, g++, gcc, all)	12m 54s
build (ubuntu:jammy, g++, gcc, horizon.so)	4m 11s
build (ubuntu:lunar, g++, gcc, all)	14m 42s
build (ubuntu:lunar, g++, gcc, horizon.so)	4m 32s
build (debian:bullseye, g++, gcc, all)	13m 8s
build (debian:bullseye, g++, gcc, horizon.so)	4m 27s
build (debian:bookworm, clang, clang, all)	13m 22s
build (debian:bookworm, clang, clang, horizon.so)	4m 30s
build (debian:bookworm, g++, gcc, all)	14m 56s
build (debian:bookworm, g++, gcc, horizon.so)	4m 40s
	2h 47m 20s

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