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

 
数据格式不规范，去掉一个逗号
Signed-off-by: Nhe-ying000 <yinghep@isoftstone.com>
Signed-off-by: N何英 <yinghep@isoftstone.com>

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

@@ -75,7 +75,7 @@
            backup : false,
            autoSync : false,
            kvStoreType : distributedData.KVStoreType.SINGLE_VERSION,
-           securityLevel : distributedData.SecurityLevel.S0,
+           securityLevel : distributedData.SecurityLevel.S0
        };
        kvManager.getKVStore('storeId', options, function (err, store) {
            if (err) {