Update CONTRIBUTING.md

CONTRIBUTING.md

@@ -692,4 +692,5 @@ available at [http://contributor-covenant.org/version/1/1/0/](http://contributor
 [us-english]: https://en.wikipedia.org/wiki/American_English
 
 [^1]: Please note that specs other than JavaScript specs are considered backend
-      code.
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+      code.
+      
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