update en/application-dev/database/database-relational-guidelines.md.

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

en/application-dev/database/database-relational-guidelines.md

@@ -55,7 +55,7 @@ The RDB provides APIs for inserting, deleting, updating, and querying data in th
   | Class| API| Description|
   | -------- | -------- | -------- |
   | RdbStore | delete(rdbPredicates:&nbsp;RdbPredicates,&nbsp;callback:&nbsp;AsyncCallback&lt;number&gt;):void | Deletes data from the RDB store based on the specified **RdbPredicates** object. This method uses a callback to return the result.<br>-&nbsp;**rdbPredicates**: conditions for deleting data.<br>-&nbsp;**callback**: callback invoked to return the number of rows deleted.|
-  | RdbStore | delete(rdbPredicates:&nbsp;RdbPredicates):&nbsp;Promise | Deletes data from the RDB store based on the specified **RdbPredicates** object. This method uses a promise to return the result.<br>-&nbsp;**rdbPredicates**: conditions for deleting data.|
+  | RdbStore | delete(rdbPredicates:&nbsp;RdbPredicates):&nbsp;Promise\<number> | Deletes data from the RDB store based on the specified **RdbPredicates** object. This method uses a promise to return the result.<br>-&nbsp;**rdbPredicates**: conditions for deleting data.|
   
 - **Querying data**