Update apparmor.md

this is a  better way to use jsonpath

Author: tengfei86

content/en/docs/tutorials/security/apparmor.md

@@ -106,7 +106,7 @@ on nodes by checking the node ready condition message (though this is likely to
 later release):
 
 ```shell
-kubectl get nodes -o=jsonpath=$'{range .items[*]}{@.metadata.name}: {.status.conditions[?(@.reason=="KubeletReady")].message}\n{end}'
+kubectl get nodes -o=jsonpath='{range .items[*]}{@.metadata.name}: {.status.conditions[?(@.reason=="KubeletReady")].message}{"\n"}{end}'
 ```
 ```
 gke-test-default-pool-239f5d02-gyn2: kubelet is posting ready status. AppArmor enabled