docs: update the grub commands for distros with systemd >= v256 #27
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对于一些较新的发行版而言（systemd 版本在 v256 及以后），仅仅设置
systemd.unified_cgroup_hierarchy=0会导致 systemd 拒绝运行，从而机器无法启动（参考链接1、参考链接2）。这对于参考 simple-sandbox 旧版说明的用户而言可能是致命的。因此，我认为应该修改文档，新增必要的内核启动参数。
当然，更长远来看，最好是项目本身能适配 cgroup v2（画大饼，别听）