Change Task titles to imperative. (#4022)

docs/tasks/configure-pod-container/attach-handler-lifecycle-event.md

@@ -1,5 +1,5 @@
 ---
-title: Attaching Handlers to Container Lifecycle Events
+title: Attach Handlers to Container Lifecycle Events
 ---
 
 {% capture overview %}
@@ -21,7 +21,7 @@ Container is terminated.
 
 {% capture steps %}
 
-## Defining postStart and preStop handlers
+## Define postStart and preStop handlers
 
 In this exercise, you create a Pod that has one Container. The Container has handlers
 for the postStart and preStop events.