fix: typo

Author: praveenpuglia

css-color-4/Overview.bs

@@ -1568,7 +1568,7 @@ Examples of HWB Colors</h3>
 <h2 id='lab-colors'>
 Device-independent Colors: Lab and LCH</h2>
 
-	Physical measurements of a color are typically expressed the Lab color space,
+	Physical measurements of a color are typically expressed as the Lab color space,
 	created in 1976 by the <abbr title='Commission Internationale de l'Eclairage'>CIE</abbr>.
 	Color conversions from one device to another also use Lab as an intermediate step.
 	Derived from human vision experiments,