fix api link

Author: huangminlinux

example/documents/APIs_zh.md

@@ -14,8 +14,8 @@
   - [setBadge](#setbadge)
   - [getBadge](#getbadge)
   - [setLocalNotification](#setlocalnotification)
-  - [点击推送启动应用事件](#open notification launch app event)
-  - [网络成功登陆事件](#network did login event)
+  - [点击推送启动应用事件](#open-notification-launch-app-event)
+  - [网络成功登陆事件](#network-did-login-event)
 - [Android Only API](#android-only-api)
   - [initPush](#initpush)
   - [stopPush](#stoppush)