Fix typo

Author: steve-hardman

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

@@ -50,7 +50,7 @@ A more detailed description of the termination behavior can be found in
 ### Hook handler implementations
 
 Containers can access a hook by implementing and registering a handler for that hook.
-There are two types of hook handlers that can be implemented for Containers:
+There are threetypes of hook handlers that can be implemented for Containers:
 
 * Exec - Executes a specific command, such as `pre-stop.sh`, inside the cgroups and namespaces of the Container.
 Resources consumed by the command are counted against the Container.