fix lint issue

Author: FilipStamenkovic

dev-docs/bidders/showheroes-bs.md

@@ -146,8 +146,6 @@ You could use this example and place it in the `test/pages/instream.html` exampl
 
 Example of adunit configuration for banner ads:
 ```javascript
-
-
 var pbjs = pbjs || {};
 pbjs.que = pbjs.que || [];
 var adUnits = [