Doc update

Author: Gissio

docs/comm.md

@@ -1,6 +1,6 @@
 # Communications protocol
 
-To establish a connection with a Rad Pro device, you can use either a serial port or an SWD connection. When using the serial port, make sure to configure it as follows:
+To establish a connection with a Rad Pro device, you can use either a USB serial port or an SWD connection. When using the USB serial port, make sure to configure it as follows:
 
 * Baudrate: 115200
 * Data bits: 8

docs/users.md

@@ -182,7 +182,7 @@ To submit data live to the https://gmcmap.com website:
 
 ## Data communications
 
-To communicate with Rad Pro through a serial port or SWD (through an ST-LINK dongle), read the [communications protocol description](comm.md).
+To communicate with Rad Pro through a USB serial port, read the [communications protocol description](comm.md).
 
 ## FAQ