fix:Add security subsystem redirect link in readme

Signed-off-by: libaoping <libaoping1@huawei.com>

README.md

@@ -47,7 +47,7 @@ The DSoftBus directory structure is as follows:
 ## Constraints
 
 -   Connections can be set up only between the devices in the same LAN or between near-field devices.
--   Before setting up a connection between two devices, you must bind the devices. For details about the binding process, see the Security subsystem readme file.
+-   Before setting up a connection between two devices, you must bind the devices. For details about the binding process, see [the Security subsystem](https://gitee.com/openharmony/docs/blob/master/zh-cn/readme/%E5%AE%89%E5%85%A8%E5%9F%BA%E7%A1%80%E8%83%BD%E5%8A%9B%E5%AD%90%E7%B3%BB%E7%BB%9F.md) readme file.
 -   After data transmission is complete, the service needs to close the session to release resources.
 
 ## Usage

README_zh.md

@@ -54,7 +54,7 @@
 ## 约束<a name="section119744591305"></a>
 
 -   组网设备需在同一局域网中 或者 距离相近的近场设备间。
--   组网之前，需先完成设备绑定，绑定流程参见安全子系统中说明。
+-   组网之前，需先完成设备绑定，绑定流程参见[安全基础能力子系统](https://gitee.com/openharmony/docs/blob/master/zh-cn/readme/%E5%AE%89%E5%85%A8%E5%9F%BA%E7%A1%80%E8%83%BD%E5%8A%9B%E5%AD%90%E7%B3%BB%E7%BB%9F.md)中说明。
 -   传输完成数据收发之后，业务要主动关闭会话，释放资源。
 
 ## 说明<a name="section1312121216216"></a>