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

Signed-off-by: N@ge-yafang <geyafang@huawei.com>
Signed-off-by: N葛亚芳 <geyafang@huawei.com>

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

@@ -249,9 +249,9 @@
 
     ```js
     "requestPermissions": 
-        {
+      {
             "name": "ohos.permission.DISTRIBUTED_DATASYNC"
-        }
+      }
     ```
 
     (2) 获取应用权限。