update zh-cn/application-dev/quick-start/har-package.md.

Signed-off-by: N耿文广 <gengwenguang@huawei.com>

zh-cn/application-dev/quick-start/har-package.md

@@ -103,7 +103,7 @@ export { MainPage } from './src/main/ets/components/MainPage/MainPage'
 ```js
 // library/src/main/ts/test.ets
 export class Log {
-    static info(msg) {
+    static info(msg: string) {
         console.info(msg);
     }
 }