fix examples

Author: shanye997

quickstarts/AliKafka/101-alikafka-instance-docs-Example/main.tf

@@ -1,5 +1,5 @@
 variable "instance_name" {
-  default = "alikafkaInstanceName"
+  default = "tf-example"
 }
 
 data "alicloud_zones" "default" {

quickstarts/Auto_Scaling/101-ess-attachment-docs-Example/README.md

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