!18851 【轻量级 PR】：update...

!18851 【轻量级 PR】：update zh-cn/application-dev/reference/apis/js-apis-inner-application-applicationStateObserver.md.
Merge pull request !18851 from donglin/N/A

zh-cn/application-dev/reference/apis/js-apis-inner-application-applicationStateObserver.md

@@ -43,5 +43,5 @@ let applicationStateObserver = {
         console.log('onProcessStateChanged onProcessStateChanged: ${JSON.stringify(processData)}');
     }
 };
-let observerCode = appManager.registerApplicationStateObserver(applicationStateObserver);
+let observerCode = appManager.on('applicationState', applicationStateObserver);
 ```
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