[css-color-5] Harmonize <rectangular-color-space> with larger list from CSS-color-4. #9445

Author: svgeesus

css-color-5/Overview.bs

@@ -2519,7 +2519,7 @@ or any other color or monochrome output device which has been characterized.
 
 	<pre class='prod'>
 		<dfn export>&lt;color-space></dfn> = <<rectangular-color-space>> | <<polar-color-space>> | <<custom-color-space>>
-		<dfn export>&lt;rectangular-color-space></dfn> = ''srgb'' | ''srgb-linear'' | ''lab'' | ''oklab'' | ''xyz'' | ''xyz-d50'' | ''xyz-d65''
+		<dfn export>&lt;rectangular-color-space></dfn> = ''srgb'' | ''srgb-linear'' | ''display-p3'' | ''a98-rgb'' | ''prophoto-rgb'' | ''rec2020'' | ''lab'' | ''oklab'' | ''xyz'' | ''xyz-d50'' | ''xyz-d65''
 		<dfn export>&lt;polar-color-space></dfn> = ''hsl'' | ''hwb'' | ''lch'' | ''oklch''
 		<dfn export>&lt;custom-color-space></dfn> = <<dashed-ident>>
 		<dfn export>&lt;hue-interpolation-method></dfn> = [ shorter | longer | increasing | decreasing ] hue