!8552 【OpenHarmony开源贡献者计划2022】+示例代码和代码区分

Merge pull request !8552 from 魏铁锤/master

zh-cn/readme/元能力子系统.md

@@ -114,8 +114,8 @@ foundation/
 | --------------------------------------------------------- | ------------------------ |
 | aa start [-d <device>] -a <ability-name> -b <bundle-name> | 启动ability，设备ID 可空 |
 
-```
 示例：
+```
 aa start -d 12345 -a com.ohos.app.MainAbility -b com.ohos.app
 ```