examples/complete: improve the examples

Author: shanye997

examples/complete/variables.tf

@@ -49,7 +49,7 @@ variable "security_ips" {
 variable "redis_engine_version" {
   description = "The specification of the redis engine version."
   type        = string
-  default     = "4.0"
+  default     = "5.0"
 }
 
 
@@ -63,4 +63,4 @@ variable "redis_lazyfree_lazy_eviction" {
   description = "The specification of the redis lazyfree-lazy-eviction."
   type        = string
   default     = "yes"
-}
+}