Update Scheduled action scope description (#24403)

Author: pednekarpraj

specification/cost-management/resource-manager/Microsoft.CostManagement/stable/2023-03-01/scheduledActions.json

@@ -765,7 +765,7 @@
           "$ref": "#/definitions/ScheduleProperties"
         },
         "scope": {
-          "description": "Cost Management scope like 'subscriptions/{subscriptionId}' for subscription scope, 'subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}' for resourceGroup scope, 'providers/Microsoft.Billing/billingAccounts/{billingAccountId}' for Billing Account scope, 'providers/Microsoft.Billing/billingAccounts/{billingAccountId}/departments/{departmentId}' for Department scope, 'providers/Microsoft.Billing/billingAccounts/{billingAccountId}/enrollmentAccounts/{enrollmentAccountId}' for EnrollmentAccount scope, 'providers/Microsoft.Billing/billingAccounts/{billingAccountId}/billingProfiles/{billingProfileId}' for BillingProfile scope, 'providers/Microsoft.Billing/billingAccounts/{billingAccountId}/invoiceSections/{invoiceSectionId}' for InvoiceSection scope, '/providers/Microsoft.CostManagement/externalBillingAccounts/{externalBillingAccountName}' for ExternalBillingAccount scope, and '/providers/Microsoft.CostManagement/externalSubscriptions/{externalSubscriptionName}' for ExternalSubscription scope.",
+          "description": "For private scheduled action(Create or Update), scope will be empty.<br /> For shared scheduled action(Create or Update By Scope), Cost Management scope can be 'subscriptions/{subscriptionId}' for subscription scope, 'subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}' for resourceGroup scope, 'providers/Microsoft.Billing/billingAccounts/{billingAccountId}' for Billing Account scope, 'providers/Microsoft.Billing/billingAccounts/{billingAccountId}/departments/{departmentId}' for Department scope, 'providers/Microsoft.Billing/billingAccounts/{billingAccountId}/enrollmentAccounts/{enrollmentAccountId}' for EnrollmentAccount scope, 'providers/Microsoft.Billing/billingAccounts/{billingAccountId}/billingProfiles/{billingProfileId}' for BillingProfile scope, 'providers/Microsoft.Billing/billingAccounts/{billingAccountId}/invoiceSections/{invoiceSectionId}' for InvoiceSection scope, '/providers/Microsoft.CostManagement/externalBillingAccounts/{externalBillingAccountName}' for ExternalBillingAccount scope, and '/providers/Microsoft.CostManagement/externalSubscriptions/{externalSubscriptionName}' for ExternalSubscription scope.",
           "type": "string"
         },
         "status": {