Fix double header in changelog

Author: Gerrit0

CHANGELOG.md

@@ -25,9 +25,6 @@
 ### Bug Fixes
 
 -   TypeDoc now supports objects with multiple index signatures, #2470.
-
-### Bug Fixes
-
 -   Header anchor links in rendered markdown are now more consistent with headers generated by TypeDoc, #2546.
 -   Types rendered in the `Returns` header are now properly colored, #2546.
 -   Links added with the `navigationLinks` option are now moved into the pull out navigation on mobile displays, #2548.