[css-color-4][editorial] Add id

Author: svgeesus

css-color-4/Overview.bs

@@ -2111,9 +2111,9 @@ HSL Colors: ''hsl()'' and ''hsla()'' functions</h2>
 	An advantage of HSL over LCH is that,
 	regardless of manipulation,
 	the result always lies inside the sRGB gamut. -->
-	A disadvantage of HSL over LCH
+	<p id="disadvantage-hsl">A disadvantage of HSL over LCH
 	is that hue manipulation changes the visual lightness,
-	and that hues are not evenly spaced apart.
+	and that hues are not evenly spaced apart.</p>
 
 	It is thus easier in HSL to create sets of matching colors
 	(by keeping the hue the same and varying the saturation and lightness),