Fix link in socket.md

Point link to latest version.

Author: Amanda Butler

docs/api/networksocket/socket.md

@@ -32,7 +32,7 @@ Not all protocols implement every function from the Socket API. For example, UDP
 
 Here is a client example of HTTP transaction over TCPSocket:
 
-[![View code](https://www.mbed.com/embed/?url=https://github.com/ARMmbed/mbed-os-example-sockets)](https://github.com/ARMmbed/mbed-os-example-sockets/blob/mbed-os-5.12/main.cpp)
+[![View code](https://www.mbed.com/embed/?url=https://github.com/ARMmbed/mbed-os-example-sockets)](https://github.com/ARMmbed/mbed-os-example-tls-socket/blob/mbed-os-5.14/main.cpp)
 
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