config: Add pin hints for probe header in generic-duet2-maestro.cfg

Signed-off-by: Kevin O'Connor <[email protected]>

config/generic-duet2-maestro.cfg

@@ -124,6 +124,11 @@ pin: PC23  # FAN0
 #[heater_fan board_cooling_fan]
 #pin: PC29  # FAN2
 
+#[bltouch]
+#sensor_pin: PC15  # Z_PROBE_IN
+#control_pin: PC26  # Z_PROBE_MOD
+#...
+
 [mcu]
 serial: /dev/serial/by-id/usb-Klipper_Klipper_firmware_12345-if00
 
@@ -135,7 +140,7 @@ max_z_velocity: 5
 max_z_accel: 100
 
 [static_digital_output led]
-pins: !PC26
+pins: !PC26  # Z_PROBE_MOD / SERVO pin
 
 # EXP1 / EXP2 (display) pins
 [board_pins]