Apply suggestions from code review

Co-authored-by: Cole Peters <[email protected]>

app/docs/md/enhance-styles/customization.md

@@ -101,9 +101,9 @@ If you’d like to opt out of the styles generated by the `theme` module, you ca
 }
 ```
 
-#### Light/Dark mode
+#### Light/dark mode
 
-By default Enhance Styles ships with light and dark mode enabled. If you want your app to support only light or only dark mode drop this CSS in your [head](/docs/conventions/head) as a global style:
+By default, Enhance Styles ships with support for automatic light and dark mode styles. If you want your app to support only light *or* dark mode, drop this CSS in your [head](/docs/conventions/head) as a global style:
 
 
 ```html