[css-color-5] Fix examples to be up to date with current syntax

Author: LeaVerou

css-color-5/Overview.bs

@@ -156,7 +156,7 @@ and a percentage of 100% returns the same color converted to the specified color
 	This example produces a mixture of 40% <span class="swatch" style="--color: peru"></span> peru
 	and 60% <span class="swatch" style="--color: lightgoldenrod"></span> lightgoldenrod.
 
-	<pre class="lang-css">color-mix(in lch peru 40% lightgoldenrod)</pre>
+	<pre class="lang-css">color-mix(in lch, peru 40%, lightgoldenrod)</pre>
 
 	The mixing is done in ''lch()'' colorspace.
 	Here is a top-down view, looking along the neutral L axis:
@@ -192,7 +192,7 @@ and a percentage of 100% returns the same color converted to the specified color
 	keeps the intermediate colors
 	as saturated as the endpoint colors.
 
-	<pre class="lang-css">color-mix(teal 65% olive in lch);</pre>
+	<pre class="lang-css">color-mix(in lch, teal 65%, olive);</pre>
 
 	<figure>
 		<img src="images/CH-mixing3.svg" style="width: 50vmin">