fixed AlertRulePayload

Tools/Sample Code/AzureSentinel-ManagementAPICsharp/AzureSentinel_ManagementAPI/Templates/ScheduledAlertRulePayload/ScheduledAlertRulePayload.json

@@ -10,7 +10,7 @@
         "Persistence",
         "LateralMovement"
       ],
-      "query": "AzureActivity | where isnotempty(OperationName)",
+      "query": "AzureActivity | where isnotempty(OperationNameValue)",
       "queryFrequency": "PT1H",
       "queryPeriod": "P2DT1H30M",
       "triggerOperator": "GreaterThan",