correct how colors are used (#842)

Author: ethanpalm

settings.mdx

@@ -66,12 +66,12 @@ See [Themes](themes) for more information.
       Must be a hex code beginning with `#`.
     </ResponseField>
     <ResponseField name="light" type="string matching ^#([a-fA-F0-9]{6}|[a-fA-F0-9]{3})$">
-      Primary color variant for light mode.
+      Light color variant of your theme.
 
       Must be a hex code beginning with `#`.
     </ResponseField>
     <ResponseField name="dark" type="string matching ^#([a-fA-F0-9]{6}|[a-fA-F0-9]{3})$">
-      Primary color variant for dark mode.
+      Dark color variant of your theme.
 
       Must be a hex code beginning with `#`.
     </ResponseField>