Update code/API_definitions/Application_Endpoint_Discovery_API.yaml

Co-authored-by: Kevin Smith <[email protected]>

Author: kohlian18

code/API_definitions/Application_Endpoint_Discovery_API.yaml

@@ -47,7 +47,9 @@ info:
     * `Phone-Number` : The device's phone number in international E.164 format.
     * `Network-Access-Identifier`: A unique identifier provided by the network
     operator.
+In addition the following application-specific identifiers must be provided
     * `ApplicationEndpointsID`: A unique identifier for the registered application endpoint.
+    * `AppId` : a unique identifier for the application
     If the API is accessed directly from a device within the operator's network,
     initial requests may be made without explicit device identifiers. However,
     if this results in a `404 Not Found` error, subsequent requests should