[PPML] Fix PCCS configuration in EHSM doc (intel-analytics#7217)

ppml/services/ehsm/kubernetes/README.md

@@ -59,7 +59,7 @@ The `dkeyserverNodeName` is the fixed node which you want to assign `dkeyserver`
 nfsServerIP: your_nfs_server_ip                   --->   <the_IP_address_of_your_NFS_server>
 nfsPath: a_nfs_shared_folder_path_on_the_server   --->   <an_existing_shared_folder_path_on_NFS_server>
 ......
-pccsIP: your_pccs_ip                              --->   <the_ip_address_in_your_subnetwork_you_have_assigned_to_pccs_in_step1>
+pccsURL: your_pccs_URL_like_https://xxxx:yyyy     --->   <the_URL_of_PCCS_service_you_have_deployed_in_step1>
 kmsIP: your_kms_ip_to_use_as                      --->   <an_unused_ip_address_in_your_subnetwork_to_assign_to_kms>
 dkeyserverNodeName: the_fixed_node_you_want_to_assign_dkeyserver_to --->   <a_node_name_in_k8s_cluster_to_run_dkerysever_on>
 ```