Update the description of runc in offline.yml (kubernetes-sigs#9783)

Signed-off-by: bo.jiang <bo.jiang@daocloud.io>

inventory/sample/group_vars/all/offline.yml

@@ -55,14 +55,16 @@
 # [Optional] cri-dockerd: only if you set container_manager: docker
 # cri_dockerd_download_url: "{{ files_repo }}/github.com/Mirantis/cri-dockerd/releases/download/v{{ cri_dockerd_version }}/cri-dockerd-{{ cri_dockerd_version }}.{{ image_arch }}.tgz"
 
+# [Optional] runc: if you set container_manager to containerd or crio
+# runc_download_url: "{{ files_repo }}/github.com/opencontainers/runc/releases/download/{{ runc_version }}/runc.{{ image_arch }}"
+
 # [Optional] cri-o: only if you set container_manager: crio
 # crio_download_base: "download.opensuse.org/repositories/devel:kubic:libcontainers:stable"
 # crio_download_crio: "http://{{ crio_download_base }}:/cri-o:/"
 # crio_download_url: "{{ files_repo }}/storage.googleapis.com/cri-o/artifacts/cri-o.{{ image_arch }}.{{ crio_version }}.tar.gz"
 # skopeo_download_url: "{{ files_repo }}/github.com/lework/skopeo-binary/releases/download/{{ skopeo_version }}/skopeo-linux-{{ image_arch }}"
 
-# [Optional] runc,containerd: only if you set container_runtime: containerd
-# runc_download_url: "{{ files_repo }}/github.com/opencontainers/runc/releases/download/{{ runc_version }}/runc.{{ image_arch }}"
+# [Optional] containerd: only if you set container_runtime: containerd
 # containerd_download_url: "{{ files_repo }}/github.com/containerd/containerd/releases/download/v{{ containerd_version }}/containerd-{{ containerd_version }}-linux-{{ image_arch }}.tar.gz"
 # nerdctl_download_url: "{{ files_repo }}/github.com/containerd/nerdctl/releases/download/v{{ nerdctl_version }}/nerdctl-{{ nerdctl_version }}-{{ ansible_system | lower }}-{{ image_arch }}.tar.gz"