Corrected grammatical error

Subject/verb disagreement: changed "...system execute the handler..." to "...system executes the handler..."

Author: SubtextRyan

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

@@ -59,7 +59,7 @@ 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 execute the handler according to the hook action,
+the Kubernetes management system executes the handler according to the hook action,
 `httpGet` and `tcpSocket` are executed by the kubelet process, and `exec` is executed in the container.
 
 Hook handler calls are synchronous within the context of the Pod containing the Container.