Remove duplicate line in whatsnew note

Author: makbigc

doc/source/whatsnew/v0.25.0.rst

@@ -252,7 +252,10 @@ Performance Improvements
 - Improved performance of :meth:`Series.map` for dictionary mappers on categorical series by mapping the categories instead of mapping all values (:issue:`23785`)
 - Improved performance of :meth:`IntervalIndex.intersection` (:issue:`24813`)
 
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+>>>>>>> Remove duplicate line in whatsnew note
 .. _whatsnew_0250.bug_fixes:
 
 Bug Fixes