Added missing pod status in pod lifecycle docs (#12397)

* Added missing pod status in pod lifecycle docs

Added information about `completed` and `CrashLoopBackOff`

* update example of completed status

content/en/docs/concepts/workloads/pods/pod-lifecycle.md

@@ -39,6 +39,9 @@ Value | Description
 `Succeeded` | All Containers in the Pod have terminated in success, and will not be restarted.
 `Failed` | All Containers in the Pod have terminated, and at least one Container has terminated in failure. That is, the Container either exited with non-zero status or was terminated by the system.
 `Unknown` | For some reason the state of the Pod could not be obtained, typically due to an error in communicating with the host of the Pod.
+`Completed` | The pod has run to completion as there's nothing to keep it running eg. Completed Jobs.
+`CrashLoopBackOff` | This means that one of the containers in the pod has exited unexpectedly, and perhaps with a non-zero error code even after restarting due to [restart policy](#restart-policy).
+
 
 ## Pod conditions