clarify the execution contexts of hook handlers with different action types are different

Signed-off-by: Weiping Cai <weiping.cai@daocloud.io>

content/en/docs/concepts/containers/container-lifecycle-hooks.md

@@ -56,7 +56,8 @@ Resources consumed by the command are counted against the Container.
 ### Hook handler execution
 
 When a Container lifecycle management hook is called,
-the Kubernetes management system executes the handler in the Container registered for that hook. 
+the Kubernetes management system execute the handler according to the hook action,
+`exec` and `tcpSocket` are executed in the container, and `httpGet` is executed by the kubelet process.
 
 Hook handler calls are synchronous within the context of the Pod containing the Container.
 This means that for a `PostStart` hook,