fix: update address_prefix attribute

Author: kirklandnuts

examples/custom-vnet/main.tf

@@ -41,9 +41,9 @@ resource "azurerm_virtual_network" "example" {
   resource_group_name = azurerm_resource_group.example.name
 
   subnet {
-    name           = "example-subnet"
-    address_prefix = "10.0.0.0/16"
-    security_group = azurerm_network_security_group.example.id
+    name             = "example-subnet"
+    address_prefixes = ["10.0.0.0/16"]
+    security_group   = azurerm_network_security_group.example.id
   }
 }