[css-color-4][editorial] Fix typo "Infiinity" => "Infinity"

Author: LucasChollet

css-color-4/Overview.bs

@@ -5815,7 +5815,7 @@ Resolving sRGB values</h3>
 		rgb(calc(400) 127 calc(-15)).
 	</div>
 
-	This clamping also takes care of values such as ''Infinity'', ''-Infiinity'', and ''NaN'' which will clamp at 255, 0 and 0 respectively.
+	This clamping also takes care of values such as ''Infinity'', ''-Infinity'', and ''NaN'' which will clamp at 255, 0 and 0 respectively.
 
 	<div class="example" id="ex-hsl-computed">
 		<p>For example, the computed value of</p>