[css-color-4] correct abbreviation

Author: svgeesus

css-color-4/Overview.bs

@@ -73,7 +73,7 @@ Introduction</h2>
 	<abbr title="red-green-blue">RGB</abbr> colorspaces,
 	[=colorspaces=] with other primaries
 	such as <abbr title="cyan-magenta-yellow-black">CMYK</abbr> or
-	<abbr title="cyan-magenta-yellow-green-orange-violet-black">CMYGOVK</abbr>
+	<abbr title="black-cyan-magenta-yellow-green-orange-violet">KCMYGOV</abbr>
 	are supported.
 
 <h3 id="values">