Reformat the Web README

Author: purinkle

web/README.md

@@ -1,9 +1,12 @@
 # Web
 
 - Avoid rendering delays caused by synchronous loading.
+
 - Use HTTPS instead of HTTP when linking to assets.
+
 - Prefer using a UTF-8 charset
-- Avoid targeting specific browsers and aim for [baseline feature support] 
+
+- Avoid targeting specific browsers and aim for [baseline feature support][]
   which means that features are widely available across major browsers.
 
 [baseline feature support]: https://web-platform-dx.github.io/web-features/