IssueNo: #I7XEJ4:[新需求]: Rectify the arkts syntax of qs on monthly

Description: Rectify the arkts syntax of qs on monthly
Sig: SIG_ApplicaitonFramework
Feature or Bugfix: Feature
Binary Source: No
Signed-off-by: N189******51 <lipeicheng5@huawei.com>

zh-cn/application-dev/quick-start/arkts-environment.md

@@ -35,7 +35,7 @@ Environment是ArkUI框架在应用程序启动时创建的单例对象。它为A
 ```ts
 // 将设备languageCode存入AppStorage中
 Environment.EnvProp('languageCode', 'en');
-let enable = AppStorage.Get('languageCode');
+let enable: undefined = AppStorage.Get<undefined>('languageCode');
 
 @Entry
 @Component