[css-2022] Add CSS Color 4 to official, fix w3c#7455

Author: svgeesus

css-2022/Overview.bs

@@ -202,12 +202,15 @@ Classification of CSS Specifications</h2>
 		<dd>
 			Replaces CSS2&sect;8.1, &sect;8.2, &sect;8.3 (but not &sect;8.3.1), and &sect;8.4.
 
-		<dt><a href="https://www.w3.org/TR/css-color-3/">CSS Color Level 3</a>
-		  [[!CSS-COLOR-3]]
+		<dt><a href="https://www.w3.org/TR/css-color-4/">CSS Color Level 4</a>
+		  [[!CSS-COLOR-4]]
 		<dd>
 			Extends and supersedes CSS2&sect;4.3.6, CSS2&sect;14.1, and CSS2&sect;18.2,
-			introducing an extended range of color values.
-			Also introduces the 'opacity' property.
+			also extends and supersedes [[CSS-COLOR-3]],
+			introducing an extended range of color spaces beyond sRGB,
+			extended color values,
+			and CSS Object Model extensions for color.
+			Also defines the 'opacity' property.
 
 		<dt><a href="https://www.w3.org/TR/css-backgrounds-3/">CSS Backgrounds and Borders Level 3</a>
 		  [[!CSS-BACKGROUNDS-3]]
@@ -317,12 +320,6 @@ Fairly Stable Modules with limited implementation experience</h3>
 			expanding the syntax, deprecating most media types,
 			and introducing new media features.
 
-		<dt><a href="https://www.w3.org/TR/css-color-4/">CSS Color Level 4</a>
-		  [[!CSS-COLOR-4]]
-		<dd>
-			Extends and supersedes [[CSS-COLOR-3]],
-			further expanding the range of colors expressible in CSS.
-
 		<dt><a href="https://www.w3.org/TR/css-display-3/">CSS Display Module Level 3</a>
 		  [[CSS-DISPLAY-3]]
 		<dd>