sync system-metrics.md

sync system-metrics.md

Author: asa3311

content/zh-cn/docs/concepts/cluster-administration/system-metrics.md

@@ -59,7 +59,7 @@ kind of time series database.
 
 Note that {{< glossary_tooltip term_id="kubelet" text="kubelet" >}} also exposes metrics in
 `/metrics/cadvisor`, `/metrics/resource` and `/metrics/probes` endpoints. Those metrics do not
-have same lifecycle.
+have the same lifecycle.
 
 If your cluster uses {{< glossary_tooltip term_id="rbac" text="RBAC" >}}, reading metrics requires
 authorization via a user, group or ServiceAccount with a ClusterRole that allows accessing