message: lestarch: fixing GPIO number in README
diff: @@ -31,7 +31,7 @@ If the UART port is not set up correctly, there will be a file open error.
  |IO23|IO25|GPIO|
  |IO24|IO17|GPIO|
  -**If you wish to see the blinking LED demo, connect an LED to GPIO 22 as follows:**
  +**If you wish to see the blinking LED demo, connect an LED to GPIO 21 as follows:**
  [Connect an LED](https://thepihut.com/blogs/raspberry-pi-tutorials/27968772-turning-on-an-led-with-your-raspberry-pis-gpio-pins)
  