samples: fix blink readme

Co-authored-by: Gilberto Conti <g.conti@arduino.cc>
Signed-off-by: TOKITA Hiroshi <tokita.hiroshi@gmail.com>

Author: gibix

samples/blinky_arduino/README.rst

@@ -23,7 +23,7 @@ Building and Running
 Build and flash Blinky as follows,
 
 ```sh
-$> west build  -p -b arduino_nano_33_ble samples/basic/arduino-blinky/ -DZEPHYR_EXTRA_MODULES=/home/$USER/zephyrproject/modules/lib/Arduino-Core-Zephyr
+$> west build  -p -b arduino_nano_33_ble samples/blinky_arduino/ -DZEPHYR_EXTRA_MODULES=/home/$USER/zephyrproject/modules/lib/Arduino-Core-Zephyr
 
 $> west flash --bossac=/home/$USER/.arduino15/packages/arduino/tools/bossac/1.9.1-arduino2/bossac
 ```