docs: Adding default note

Author: dploeger

README.md

@@ -126,7 +126,7 @@ The following input variables are optional (have default values):
 
 ### api\_server\_ip\_ranges
 
-Description: The IP ranges to allow for incoming traffic to the server nodes. To disable the limitation, set an empty list as value.
+Description: The IP ranges to allow for incoming traffic to the server nodes. To disable the limitation, set an empty list as value (default).
 
 Type: `list(string)`
 

vars.tf

@@ -165,7 +165,7 @@ variable "ssh_public_key" {
 
 variable "api_server_ip_ranges" {
   type        = list(string)
-  description = "The IP ranges to allow for incoming traffic to the server nodes. To disable the limitation, set an empty list as value."
+  description = "The IP ranges to allow for incoming traffic to the server nodes. To disable the limitation, set an empty list as value (default)."
   default     = []
 }