!8273 【轻量级 PR】：update zh-cn/application-dev/database/database-relational-guidelines.md.

Merge pull request !8273 from 葛亚芳/N/A

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

@@ -197,7 +197,7 @@
     import data_rdb from '@ohos.data.rdb'
 
     const CREATE_TABLE_TEST = "CREATE TABLE IF NOT EXISTS test (" + "id INTEGER PRIMARY KEY AUTOINCREMENT, " + "name TEXT NOT NULL, " + "age INTEGER, " + "salary REAL, " + "blobType BLOB)";
-    const STORE_CONFIG = {name: "rdbstore.db",}
+    const STORE_CONFIG = {name: "rdbstore.db"}
     data_rdb.getRdbStore(this.context, STORE_CONFIG, 1, function (err, rdbStore) {
         rdbStore.executeSql(CREATE_TABLE_TEST)
         console.info('create table done.')
@@ -214,7 +214,7 @@
 
     ```js
     var u8 = new Uint8Array([1, 2, 3])
-    const valueBucket = {"name": "Tom", "age": 18, "salary": 100.5, "blobType": u8,}
+    const valueBucket = {"name": "Tom", "age": 18, "salary": 100.5, "blobType": u8}
     let insertPromise = rdbStore.insert("test", valueBucket)
     ```
 
@@ -360,6 +360,5 @@
 
 ## 相关实例
 针对关系型数据库开发，有以下相关实例可供参考：
-- [`Rdb`：关系型数据库（eTS）（API8）](https://gitee.com/openharmony/app_samples/tree/master/data/Rdb)
 - [`DistributedRdb`：分布式关系型数据库（eTS）（API8）](https://gitee.com/openharmony/app_samples/tree/master/data/DistributedRdb)
 - [关系型数据库（JS）（API8）](https://gitee.com/openharmony/codelabs/tree/master/Data/JSRelationshipData)