Update readme_cn.md

zhifu gao

2023-07-03 4a47e3b3dc0a1eeec17868763f9faae7da58bb4a

 egs/aishell/transformer/utils/cmvn_converter.py

@@ -9,16 +9,14 @@
        formatter_class=argparse.ArgumentDefaultsHelpFormatter,
    )
    parser.add_argument(
        "--cmvn-json",
        "-c",
        "--cmvn_json",
        default=False,
        required=True,
        type=str,
        help="cmvn json file",
    )
    parser.add_argument(
        "--am-mvn",
        "-a",
        "--am_mvn",
        default=False,
        required=True,
        type=str,