[css-images] Kill the issue about renaming 'auto' to 'smooth' - we have a 'high-quality' value now, and 'auto' appears to be the best default behavior anyway.

Author: tabatkins

css-images/Overview.bs

@@ -1897,10 +1897,6 @@ Determing How To Scale an Image: the 'image-rendering' property {#the-image-rend
 			to preserve a "pixelated" look as the image changes in size.
 	</dl>
 
-	Issue: Should we move the current ''image-rendering/auto'' behavior to a well-named keyword (''smooth''?)
-	and just define ''image-rendering/auto'' to be "whatever the UA wants",
-	which is what ''image-rendering/auto'' usually means?
-
 	This property does not dictate any particular scaling algorithm to be used.
 	For example, with ''image-rendering: auto'',
 	a user agent might scale images with bilinear interpolation by default,