[css-color] Whoopsiedoodle, close the <dl> this time.

Author: tabatkins

css-color/Overview.bs

@@ -1852,6 +1852,7 @@ Predefined colorspaces: ''srgb'', ''dci-p3'', and ''rec2020''.</h3>
 
 			Where α=1.09929682680944  and β=0.018053968510807
 			<!-- full-precision constants here, not the rounded ones for 10 or 12bit components -->.
+	</dl>
 
 <h4 id="predefined-to-lab">
 Converting predefined colorspaces to Lab</h4>