Added commented out board.STEMMA_I2C with explanation

Author: evaherrada

examples/mlx90640_pil.py

@@ -16,7 +16,8 @@
 COLORDEPTH = 1000  # how many color values we can have
 INTERPOLATE = 10  # scale factor for final image
 
-mlx = adafruit_mlx90640.MLX90640(board.I2C())
+mlx = adafruit_mlx90640.MLX90640(board.I2C())  # uses board.SCL and board.SDA
+# i2c = board.STEMMA_I2C()  # For using the built-in STEMMA QT connector on a microcontroller
 
 # the list of colors we can choose from
 heatmap = (