update contributing guidelines

Author: neverRare

CONTRIBUTING.md

@@ -65,13 +65,14 @@ Please don't do the following, we can do this ourselves.
 
 More things to remember:
 
-(These aren't strict rules. It's perfectly fine to not follow any of these, we
-can adapt.)
-
 - Keep the source code as runtime agnostic as possible. We target the browser
   and Deno. This is necessary because we use `deno test`. If a module is
   exclusive to one runtime, add a note above the code:
   `// This code is browser/Deno only`.
+
+(The following aren't strict rules. It's perfectly fine to not follow any of
+these, we can adapt.)
+
 - Ensure all the files are formatted: Run `deno fmt`.
 - Make sure you don't accidentally make more tests fail: Run
   `deno test --parallel` before and after making changes to the code. Some tests