sync etcd.md

sync etcd.md

Author: asa3311

content/zh-cn/docs/reference/glossary/etcd.md

@@ -35,7 +35,7 @@ tags:
 <!--
 If your Kubernetes cluster uses etcd as its backing store, make sure you have a
 [back up](/docs/tasks/administer-cluster/configure-upgrade-etcd/#backing-up-an-etcd-cluster) plan
-for those data.
+for the data.
 -->	
 如果你的 Kubernetes 集群使用 etcd 作为其后台数据库，
 请确保你针对这些数据有一份