minor intro paragraph elaborations

Author: Adam Argyle

css-color-5/Overview.bs

@@ -20,12 +20,13 @@ Introduction {#intro}
 
 	<em>This section is not normative.</em>
 
-	Web developers, design tools and design systems developers
-	often use functions to design components.
-	With the increasing usage of design systems that support multiple platforms,
-	and increased capability of Dark Mode in UI,
+	Web developers, design tools and design system developers
+	often use color functions to assist in scaling the design 
+	of their component color relations.
+	With the increasing usage of design systems that support multiple platforms 
+	and multiple user preferences, like the increased capability of Dark Mode in UI,
 	this becomes even more useful to not need to manually set color,
-	and to instead have a single source from which layouts are calculated.
+	and to instead have a single source from which schemes are calculated.
 
 	Currently Sass, calc() on HSL values, or PostCSS is used to do this.
 	Preprocessors are unable to work on dynamically adjusted colors,