chore(driver): add comment about flag definition #4878

Job	Run time
build-libs-linux-amd64-static 🎃	21m 44s
build-libs-linux-amd64-asan 🧐	8m 14s
build-libs-linux-amd64 😁 (system_deps)	5m 11s
build-libs-emscripten 🧐	3m 49s
build-libs-linux-amd64 😁 (bundled_deps)	16m 43s
build-libs-others-amd64 😨 (windows-latest)	9m 3s
build-libs-linux-amd64 😁 (system_deps_w_chisels)	5m 29s
build-shared-libs-linux-amd64 🧐	3m 37s
build-shared-libs-macos-amd64 😨	4m 4s
build-libs-linux-amd64 😁 (system_deps_minimal)	3m 55s
build-libs-others-amd64 😨 (macos-latest)	8m 22s
build-libs-linux-arm64 😁 (system_deps)	5m 21s
run-e2e-tests-amd64 (system_deps)	8m 20s
test-libs-static (bundled_deps)	15m 23s
run-e2e-tests-amd64 (bundled_deps)	19m 58s
build-libs-linux-arm64 😁 (bundled_deps)	16m 31s
run-e2e-tests-amd64 (system_deps_w_chisels)	9m 31s
build-libs-linux-arm64 😁 (system_deps_w_chisels)	5m 28s
run-e2e-tests-amd64 (asan)	21m 30s
build-libs-linux-arm64 😁 (system_deps_minimal)	3m 45s
	3h 15m 58s

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