MC-6298: Beta 3 docs release notes

Removed extra space

Author: bdenham

docs/release-notes.md

@@ -4,8 +4,6 @@ Here are the Page Builder beta release notes and the higher priority known issue
 
 ## Beta 3 - December 19, 2018
 
-
-
 - Improved: Handling of invalid Google Maps API keys <!-- MC-5723 -->
 
 - Removed: Legacy overlay transparency field from banner & slider in favor of using the color picker <!-- MC-3895 -->