[css-color-5][css-color-4] Consistent mention of display-p3-linear in color(...) syntax

Author: romainmenke

css-color-5/Overview.bs

@@ -1838,7 +1838,7 @@ The result of this function is in the color space of the origin color.
 		<dfn>&lt;colorspace-params></dfn> = [<<custom-params>> | <<predefined-rgb-params>> | <<xyz-params>>]
 		<dfn>&lt;custom-params></dfn> = <<dashed-ident>> [ <<number>> | <<percentage>> | none ]+
 		<dfn>&lt;predefined-rgb-params></dfn> = <<predefined-rgb>> [ <<number>> | <<percentage>> | none ]{3}
-		<dfn>&lt;predefined-rgb></dfn> = srgb | srgb-linear | display-p3 | a98-rgb | prophoto-rgb | rec2020
+		<dfn>&lt;predefined-rgb></dfn> = srgb | srgb-linear | display-p3 | display-p3-linear | a98-rgb | prophoto-rgb | rec2020
 		<dfn>&lt;xyz-params></dfn> = <<xyz-space>> [ <<number>> | <<percentage>> | none ]{3}
 	</pre>