Updated Whisper Push Notifications (markdown)

Whisper-Push-Notifications.md

@@ -50,7 +50,7 @@ statusd --datadir app1 --http --httpport 8645 --shh
 statusd --datadir app2 --http --httpport 8745 --shh
 ```
 
-# Discovery and obtaining Subscription Key
+# Workflow: Discovery, Subscription, Chat Management, Notification Triggering
 
 Original workflow for discovery mechanism was introduced in:
 
@@ -134,6 +134,10 @@ var sendAcceptServerRequest = function (identity, serverID) {
     }
 };
 ```
+To complete discovery protocol, we need to receive ACK message from the Notification Server we selected. Server's ACK message will also include SymKey, which we will use to communicate securely with server down the line:
+
+```js
+```
 
 ### 2. Creating Chat session and registering device