[css-color-4] Correction to ray trace to avoid throwing off our intersection calculation

#10579 (comment)

Author: svgeesus

css-color-4/Overview.bs

@@ -6165,7 +6165,7 @@ Sample Pseudocode for the Ray Trace Gamut Mapping</h4>
 				</li>
 			</ul>
 		</li>
-		<li>if |tnear| is infinite (or matches the initial very large value)
+		<li>if (|tnear| > 10)
 			<ul>
 				<li>return INTERSECTION NOT FOUND</li>
 			</ul>