fix example (Azure#11631)

Co-authored-by: Ashraf Hamad <ahamad@ntdev.microsoft.com>

Author: 2 people

specification/eventgrid/resource-manager/Microsoft.EventGrid/stable/2020-06-01/examples/EventSubscriptions_CreateOrUpdateForCustomTopic_WebhookDestination.json

@@ -6,9 +6,9 @@
     "eventSubscriptionInfo": {
       "properties": {
         "destination": {
-          "endpointType": "EventHub",
+          "endpointType": "WebHook",
           "properties": {
-            "resourceId": "/subscriptions/55f3dcd4-cac7-43b4-990b-a139d62a1eb2/resourceGroups/TestRG/providers/Microsoft.EventHub/namespaces/ContosoNamespace/eventhubs/EH1"
+            "endpointUrl": "https://azurefunctionexample.azurewebsites.net/runtime/webhooks/EventGrid?functionName=EventGridTrigger1&code=PASSWORDCODE"
           }
         },
         "filter": {
@@ -25,7 +25,7 @@
         "properties": {
           "destination": {
             "properties": {
-              "endpointBaseUrl": "https://requestb.in/15ksip71"
+              "endpointBaseUrl": "https://azurefunctionexample.azurewebsites.net/runtime/webhooks/EventGrid"
             },
             "endpointType": "WebHook"
           },