ダウンローダのCLIオプションで`clap::Arg::value_name`を設定 (#604) #1693

Job	Run time
build_and_deploy_strategy_matrix	2s
build_and_deploy (windows-2019, directml, x86_64-pc-windows-msvc, windows-x64-directml, directml,...	14m 13s
build_and_deploy (ubuntu-20.04, x86_64-unknown-linux-gnu, linux-x64-gpu, cuda, true)	6m 20s
build_and_deploy (macos-11, aarch64-apple-darwin, osx-arm64-cpu, cpu, false)	9m 36s
build_xcframework	0s
	30m 11s

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