【文档体验官】开发步骤里面的代码示例少了一行代码

【任务描述】
开发步骤里面的代码示例少了一行代码，复制过来直接报错
【解决方案】
增加 onCreate(want) {这行代码，如下：

class ServiceExt extends ServiceExtensionAbility {
     onCreate(want) {
          console.log('onCreate, want:' + want.abilityName);
    }

    onRequest(want, startId) {
        console.log('onRequest, want:' + want.abilityName);
    }

    onConnect(want) {
        console.log('onConnect , want:' + want.abilityName);
        return new StubTest("test");
    }

    onDisconnect(want) {
        console.log('onDisconnect, want:' + want.abilityName);
    }

    onDestroy() {
        console.log('onDestroy');
    }
}

【任务来源】
https://gitee.com/openharmony/docs/blob/master/zh-cn/application-dev/ability/stage-serviceextension.md#%E5%BC%80%E5%8F%91%E6%AD%A5%E9%AA%A4