DTLSSocket example paragraph added

Author: KariHaapalehto

docs/api/networksocket/DTLSSocket.md

@@ -10,6 +10,10 @@ To use secure DTLS connections, application use the `DTLSSocketWrapper` through
 
 [![View code](https://www.mbed.com/embed/?type=library)](https://os.mbed.com/docs/development/mbed-os-api-doxy/class_d_t_l_s_socket.html)
 
+### DTLSSocket example
+
+For example, please see the TLSSocket socket example.
+
 ### Related content
 
 - [Secure Socket](../reference/secure-socket.html)