Add example with "Ctrl+Q" to serial ports monitor as exit key // Resolve #386

docs/userguide/cmd_serialports.rst

@@ -191,7 +191,10 @@ Do not apply any encodings/transformations
     --exit-char
 
 ASCII code of special character that is used to exit the application,
-default ``29`` (DEC)
+default ``29`` (DEC).
+
+For example, to use ``Ctrl+Q`` run
+``platformio serialports monitor --exit-char 17``.
 
 .. option::
     --menu-char