[css-color-5] color-mix: Allow color space argument to be in any order

Author: LeaVerou

css-color-5/Overview.bs

@@ -121,7 +121,7 @@ Mixing colors: the ''color-mix()'' function {#color-mix}
 
 
 <pre class='prod'>
-	<dfn>color-mix()</dfn> = color-mix( in <<colorspace>> <<color>>{2} && [ <<percentage>> ]?)
+	<dfn>color-mix()</dfn> = color-mix( in <<colorspace>> && <<color>>{2} && [ <<percentage>> ]?)
 </pre>
 
 If a percentage is omitted, it defaults to 50% (an equal mix of the two colors).
@@ -181,7 +181,7 @@ and 50% produces an equal mix of both.
 	keeps the intermediate colors
 	as saturated as the endpoint colors.
 
-	<pre class="lang-css">color-mix(in lch teal 65% olive);</pre>
+	<pre class="lang-css">color-mix(teal 65% olive in lch);</pre>
 
 	<figure>
 		<img src="images/CH-mixing3.svg" style="width: 50vmin">