【OpenHarmony开源贡献者计划2022】update zh-cn/application-dev/database/database-relational-guidelines.md.

json数据退格
Signed-off-by: zhongwenc<zhongwenc@isoftstone.com>
Signed-off-by: N文中 <zhongwenc@isoftstone.com>

zh-cn/application-dev/database/database-relational-guidelines.md

@@ -250,9 +250,9 @@
 
     ```js
     "requestPermissions": 
-    {
+      {
         "name": "ohos.permission.DISTRIBUTED_DATASYNC"
-    }
+      }
     ```
 
     (2) 获取应用权限。