optimize config demo (#582)

spring-cloud-tencent-examples/polaris-config-example/src/main/java/com/tencent/cloud/polaris/config/example/ConfigController.java

@@ -18,7 +18,6 @@ package com.tencent.cloud.polaris.config.example;
 
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.beans.factory.annotation.Value;
-import org.springframework.cloud.context.config.annotation.RefreshScope;
 import org.springframework.core.env.Environment;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.RestController;
@@ -29,7 +28,6 @@ import org.springframework.web.bind.annotation.RestController;
  * @author lepdou 2022-03-10
  */
 @RestController
-@RefreshScope
 public class ConfigController {
 
 	@Value("${timeout:1000}")

spring-cloud-tencent-examples/polaris-config-example/src/main/resources/bootstrap.yml

@@ -12,7 +12,6 @@ spring:
         groups:
           - name: ${spring.application.name} # group name
             files: [ "config/application.properties", "config/bootstrap.yml" ] # config/application.properties takes precedence over config/bootstrap.yml
-        refresh-type: refresh_context
 management:
   endpoints:
     web: