[css-color-4][editorial] dedup IDs

Author: svgeesus

css-color-4/Overview.bs

@@ -4816,7 +4816,7 @@ Gamut Mapping
 		Simple gamut mapping in CIE LCH would give unsatisfactory results.
 	</div>
 
-	<div class="example" id="CIELCH-p3-yellow-noclip">
+	<div class="example" id="OKLCH-p3-yellow-noclip">
 		In this example, Display P3 primary yellow (<code>color(display-p3 1 1 0</code>)
 		has the chroma progressively reduced, but this time in OKLCH color space.
 		<figure>
@@ -4872,7 +4872,7 @@ Gamut Mapping
 		Gamut mapping in CIE LCH with local clip would give acceptable results.
 	</div>
 
-	<div class="example" id="CIELCH-p3-yellow-clip">
+	<div class="example" id="OKLCH-p3-yellow-clip">
 		In this example, Display P3 primary yellow (<code>color(display-p3 1 1 0</code>)
 		has the chroma progressively reduced, but this time in OKLCH color space
 		and with the local clip modification.