About how to use and explaination of available options. Signed-off-by: Sun Jianbo <wonderflow@zju.edu.cn>
Cut the long lines and add `--config` to the `nsinit exec` command. And some grammar fix. Signed-off-by: Qiang Huang <h.huangqiang@huawei.com>
Signed-off-by: Sun Jianbo <wonderflow@zju.edu.cn>