Update Matrix8x8.py

issue adafruit#13

Author: nonflammable

Adafruit_LED_Backpack/Matrix8x8.py

@@ -34,7 +34,7 @@ def __init__(self, **kwargs):
 
     def set_pixel(self, x, y, value):
         """Set pixel at position x, y to the given value.  X and Y should be values
-        of 0 to 8.  Value should be 0 for off and non-zero for on.
+        of 0 to 7.  Value should be 0 for off and non-zero for on.
         """
         if x < 0 or x > 7 or y < 0 or y > 7:
             # Ignore out of bounds pixels.