Minor: Adjust readme formatting.

banners/readme.md

@@ -5,9 +5,8 @@ To add a banner, create an 772x250 pixel image and save it as `$slug-772x250.png
 To support high-DPI displays, you can include an additional 1544x500 px banner named `$slug-1544x500.png` or `$slug-1544x500.jpg`.
 
 See these links for more information:
-https://wordpress.org/plugins/about/faq/#banners
-https://make.wordpress.org/core/2012/07/04/fun-with-high-dpi-displays/
-
+- https://wordpress.org/plugins/about/faq/#banners
+- https://make.wordpress.org/core/2012/07/04/fun-with-high-dpi-displays/
 
 
 (Themes have a different update information screen that doesn't include a banner.)