update zh-cn/application-dev/reference/apis/js-apis-distributedKVStore.md.

Signed-off-by: N葛亚芳 <geyafang@huawei.com>

zh-cn/application-dev/reference/apis/js-apis-distributedKVStore.md

@@ -271,9 +271,9 @@ createKVManager(config: KVManagerConfig): KVManager
 Stage模型下的示例：
 
 ```js
-import AbilityStage from '@ohos.application.Ability'
+import UIAbility from '@ohos.app.ability.UIAbility'
 let kvManager;
-export default class MyAbilityStage extends AbilityStage {
+export default class EntryAbility extends UIAbility {
     onCreate() {
         console.log("MyAbilityStage onCreate")
         let context = this.context