Update howto-platform-prerequisites.md

Author: sushantjrao

articles/operator-nexus/howto-platform-prerequisites.md

@@ -146,8 +146,8 @@ Terminal Server has been deployed and configured as follows:
     - HTTP access is enabled
   - Terminal Server interface is connected to the operators on-premises Provider Edge routers (PEs) and configured with the IP addresses and credentials
   - Terminal Server is accessible from the management VPN
-  - To upgrade the terminal server to OS version 24.11.2 [refer](./howto-upgrade-os-of-terminal-server.md)
-  - To setup single session and session timeout for serial console [refer](./howto-restrict-serial-port-access-and-set-timeout-on-terminal-server.md)
+  - To upgrade the terminal server to OS version 24.11.2 [refer](/articles/operator-nexus/howto-upgrade-os-of-terminal-server.md)
+  - To setup single session and session timeout for serial console [refer](/articles/operator-nexus/howto-restrict-serial-port-access-and-set-timeout-on-terminal-server.md)
 
 ### Step 1: Setting up hostname