Update docs/api/networkinterfaces/CellularInterface.md

Author: Qinghao Shi

docs/api/networkinterfaces/CellularInterface.md

@@ -65,7 +65,7 @@ To bring up the network interface:
 
 This example establishes connection with the cellular network using Mbed OS CellularInterface.
 
-[![View code](https://www.mbed.com/embed/?url=github.com/ARMmbed/mbed-os-examples-docs_only/blob/master/APIs_NetworkInterfaces/Cellular/)](github.com/ARMmbed/mbed-os-examples-docs_only/blob/master/APIs_NetworkInterfaces/Cellular/main.cpp)
+[![View code](https://www.mbed.com/embed/?url=https://github.com/ARMmbed/mbed-os-example-cellular/tree/master)](https://github.com/ARMmbed/mbed-os-example-cellular/blob/master/main.cpp)
 
 ## Related content