comment fix

Author: RetiredWizard

adafruit_imageload/png.py

@@ -108,7 +108,7 @@ def load(  # noqa: PLR0912, PLR0915, Too many branches, Too many statements
         bmp = bitmap(width, height, colors)
         mem = memoryview(bmp)
         for y in range(height):
-            # Adjust for Displayio.Bitmap filler to scanline at byte boundry
+            # Adjust for Displayio.Bitmap filler to scanline at 4-byte boundry
             filladj = y * ((4 - (width % 4)) % 4)
             dst = y * scanline + filladj
             src = y * (scanline + 1) + 1