fixed bf65c631 from https://gitee.com/zhangyafei-echo/docs/pulls/10942

IssueNo:
Description:Fix import in stage-call.md
Sig:SIG_ApplicationFramework
Feature or BugFix: BugFix
Binary Source: No
Signed-off-by: Nzhangyafei.echo <zhangyafei12@huawei.com>
Change-Id: I64c866b853382ee9315fde4feea45d74bc7cd402

zh-cn/application-dev/ability/stage-ability.md

@@ -176,7 +176,7 @@ context.requestPermissionsFromUser(permissions).then((data) => {
 
 如下示例展示了AbilityStage的`onConfigurationUpdated`回调实现，系统语言和颜色模式发生变化时触发该回调。具体示例代码如下：
 ```ts
-import Ability from '@ohos.application.Ability'
+import AbilityStage from '@ohos.application.AbilityStage'
 import ConfigurationConstant from '@ohos.application.ConfigurationConstant'
 
 export default class MyAbilityStage extends AbilityStage {