update etcd download url in offline.yml

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

inventory/sample/group_vars/all/offline.yml

@@ -29,7 +29,7 @@
 # crictl_download_url: "{{ files_repo }}/kubernetes/cri-tools/crictl-{{ crictl_version }}-{{ ansible_system | lower }}-{{ image_arch }}.tar.gz"
 
 ## [Optional] etcd: only if you **DON'T** use etcd_deployment=host
-# etcd_download_url: "{{ files_repo }}/kubernetes/etcd/etcd-{{ etcd_version }}-linux-amd64.tar.gz"
+# etcd_download_url: "{{ files_repo }}/kubernetes/etcd/etcd-{{ etcd_version }}-linux-{{ image_arch }}.tar.gz"
 
 # [Optional] Calico: If using Calico network plugin
 # calicoctl_download_url: "{{ files_repo }}/kubernetes/calico/{{ calico_ctl_version }}/calicoctl-linux-{{ image_arch }}"