[css-images-4][editorial] Consistent case for Oklch, #7880

Author: svgeesus

css-images-4/Overview.bs

@@ -1299,7 +1299,7 @@ to bring them back into gamut.
 	#A37 and #595 is drawn in five different colorspaces,
 	two of them polar.
 	From top to bottom:
-	CIE LCH, CIE Lab, sRGB, Oklab, OKLCH.
+	CIE LCH, CIE Lab, sRGB, Oklab, Oklch.
 
 	The rectangular spaces have a greyish midpoint,
 	while the intermediate colors in the polar spaces