[css-color-hdr-1] Remove duplicate productions

They are already existing as is in CSS Color 5.

Author: cdoublev

css-color-hdr-1/Overview.bs

@@ -602,26 +602,22 @@ Mixing Dynamic Range Limits: the ''dynamic-range-limit-mix()'' function {#dynami
 	in a particular, given [=color space=]
 	(rather than the implicit sRGB color space that most of the other color functions operate in).
 
-	In this specification the ''color()'' function is extended
+	In this specification, 
+	the <<colorspace-params>> taken by the ''color()'' function is extended
 	to allow <a href="#predefined-HDR">predefined color spaces for HDR</a>,
 	in addition to the predefined SDR spaces from [[css-color-4#predefined]]
 	and the relative color syntax from [[css-color-5#relative-colors]].
 
 	Its syntax is now as follows:
 
 	<pre class='prod'>
-		<dfn>color()</dfn> = color( [from <<color>>]? <<colorspace-params>> [ / [ <<alpha-value>> | none ] ]? )
 		<dfn>&lt;colorspace-params></dfn> = [<<custom-params>> | <<predefined-rgb-params>> | 
 			<<predefined-polar-params>> | <<predefined-rectangular-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-polar-params></dfn> = jzczhz [ <<number>> | <<percentage>> | none ]{2} [ <<hue>> | none]
 		<dfn>&lt;predefined-rectangular-params></dfn> = <<predefined-rectangular>> [ <<number>> | <<percentage>> | none ]{3}
 		<dfn>&lt;predefined-rgb></dfn> = srgb | srgb-linear | display-p3 | a98-rgb | prophoto-rgb | rec2020 | 
 			rec2100-pq | rec2100-hlg | rec2100-linear
 		<dfn>&lt;predefined-rectangular></dfn> = jzazbz | ictcp
-		<dfn>&lt;xyz-params></dfn> = <<xyz>> [ <<number>> | <<percentage>> | none ]{3}
-		<dfn>&lt;xyz></dfn> = xyz | xyz-d50 | xyz-d65
 	</pre>