Add documentation on what the DrawBounds colors mean

draw.go

@@ -50,7 +50,10 @@ func Draw (destination draw.Image, setter *TypeSetter, offset fixed.Point26_6, c
 }
 
 // DrawBounds draws the LayoutBounds, MinimumSize, and LayoutBoundsSpace of a
-// TypeSetter to the given image.
+// TypeSetter to the given image using these colors:
+//   - Red:   LayoutBounds
+//   - Green: MinimumSize
+//   - Blue:  LayoutBoundsSpace
 func DrawBounds (destination draw.Image, setter *TypeSetter, offset fixed.Point26_6) {
 	blue  := color.RGBA { B: 255, A: 255 }
 	red   := color.RGBA { R: 255, A: 255 }