Update Remove-AzApiManagementProduct.md

Author: cormacpayne

src/ResourceManager/ApiManagement/Commands.ApiManagement/help/Remove-AzApiManagementProduct.md

@@ -26,7 +26,7 @@ The **Remove-AzApiManagementProduct** cmdlet removes an existing API Management
 ### Example 1: Remove an existing product and all subscriptions
 ```powershell
 PS C:\>$apimContext = New-AzApiManagementContext -ResourceGroupName "Api-Default-WestUS" -ServiceName "contoso"
-PS C:\>Remove-AzApiManagementProduct -Context $apimContext -Id "0123456789" -DeleteSubscriptions -Force
+PS C:\>Remove-AzApiManagementProduct -Context $apimContext -ProductId "0123456789" -DeleteSubscriptions -Force
 ```
 
 This command removes an existing product and all subscriptions.