[css-color-adjust-1][editorial] wording adjustment

Author: tabatkins

css-color-adjust-1/Overview.bs

@@ -181,10 +181,10 @@ Opting Into a Preferred Color Scheme: the 'color-scheme' property {#color-scheme
 	</dl>
 
 	<div class=example>
-		A well-written page
-		that responds to user preferences for light or dark display
+		A well-written page--
+		one that responds to user preferences for light or dark display
 		by using the 'prefers-color-scheme' media feature
-		to alter the colors it uses
+		to alter the colors it uses--
 		can easily opt the browser-controlled UI
 		(scrollbars, inputs, etc)
 		into the user's preferred color scheme as well