improve the examples

Author: shanye997

quickstarts/Alidns/101-alidns-address-pool-docs-Example/main.tf

@@ -37,7 +37,12 @@ resource "alicloud_alidns_address_pool" "default" {
   lba_strategy      = "RATIO"
   type              = "IPV4"
   address {
-    attribute_info = "{\"lineCodeRectifyType\":\"RECTIFIED\",\"lineCodes\":[\"os_namerica_us\"]}"
+    attribute_info = <<EOF
+    {
+      "lineCodeRectifyType": "RECTIFIED",
+      "lineCodes": ["os_namerica_us"]
+    }
+    EOF
     remark         = "address_remark"
     address        = "1.1.1.1"
     mode           = "SMART"

quickstarts/Application_Load_Balancer(ALB)/101-alb-listener-additional-certificate-attachment-docs-Example/main.tf

@@ -1,3 +1,6 @@
+provider "alicloud" {
+  region = "cn-hangzhou"
+}
 variable "name" {
   default = "tf_example"
 }

quickstarts/Cloud_DBAudit(DBAudit)/101-yundun-dbaudit-instance-docs-Example/main.tf

@@ -10,7 +10,7 @@ data "alicloud_zones" "default" {
 }
 
 data "alicloud_vpcs" "default" {
-  name_regex = "default-NODELETING"
+  name_regex = "^default-NODELETING$"
 }
 data "alicloud_vswitches" "default" {
   vpc_id  = data.alicloud_vpcs.default.ids.0