Fix examples

Author: niuzhenguo

examples/vpc_basic/main.tf

@@ -10,8 +10,8 @@ module "example" {
   source ="../.."
 
   // VPC
-  name        = "testVPC"
-  description = "testVPC description"
+  name = "testVPC"
+  cidr = "10.0.0.0/16"
 
   // VPC Subnet
   subnets = [
@@ -24,7 +24,7 @@ module "example" {
       name       = "testSubnet-2"
       cidr       = "10.0.2.0/24"
       gateway_ip = "10.0.2.1"
-      availability_zone = "cn-north-1"
+      availability_zone = "cn-north-1a"
     },
     {
       name       = "tetSubnet-3"

examples/vpc_with_existing_vpc_id/main.tf

@@ -27,7 +27,7 @@ module "example" {
       name       = "testSubnet-2"
       cidr       = "10.0.2.0/24"
       gateway_ip = "10.0.2.1"
-      availability_zone = "cn-north-1"
+      availability_zone = "cn-north-1a"
     },
     {
       name       = "tetSubnet-3"