website: Add complex type example to variables.html

website/docs/configuration/variables.html.md

@@ -46,6 +46,21 @@ variable "availability_zone_names" {
   type    = list(string)
   default = ["us-west-1a"]
 }
+
+variable "docker_ports" {
+  type = list(object({
+    internal = number
+    external = number
+    protocol = string
+  }))
+  default = [
+    {
+      internal = 8300
+      external = 8300
+      protocol = "tcp"
+    }
+  ]
+}
 ```
 
 The label after the `variable` keyword is a name for the variable, which must