Remove unnecessary detail on restart-a-tidb-cluster page (#2920)

Author: dveeden

en/restart-a-tidb-cluster.md

@@ -6,7 +6,7 @@ aliases: ['/docs/tidb-in-kubernetes/dev/restart-a-tidb-cluster/']
 
 # Restart a TiDB Cluster on Kubernetes
 
-If you find that the memory leak occurs in a Pod during use, you need to restart the cluster. This document describes how to perform a graceful rolling restart to all Pods in a TiDB component and how to perform a graceful restart to a single TiKV Pod.
+This document describes how to perform a graceful rolling restart to all Pods in a TiDB component and how to perform a graceful restart to a single TiKV Pod.
 
 > **Warning:**
 >

zh/restart-a-tidb-cluster.md

@@ -6,7 +6,7 @@ aliases: ['/docs-cn/tidb-in-kubernetes/dev/restart-a-tidb-cluster/']
 
 # 重启 Kubernetes 上的 TiDB 集群
 
-在使用 TiDB 集群的过程中，如果你发现某个 Pod 存在内存泄漏等问题，需要对集群进行重启，本文描述了如何优雅滚动重启 TiDB 集群内某个组件的所有 Pod，或优雅重启单个 TiKV Pod。
+本文介绍如何优雅滚动重启 TiDB 集群内某个组件的所有 Pod，或优雅重启单个 TiKV Pod。
 
 > **警告：**
 >