!19869 示例代码更新

Merge pull request !19869 from ningning/OpenHarmony-3.2-Release

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

@@ -1109,7 +1109,7 @@ scrollSearch(on: On): Promise\<Component>
 ```js
 async function demo() {
     let driver = Driver.create();
-    let button = await driver.findComponent(ON.type('Scroll'));
+    let scrollBar = await driver.findComponent(ON.type('Scroll'));
     let button = await scrollBar.scrollSearch(ON.text('next page'));
 }
 ```