Remove HEAD, and badly formatted whatsnew

Author: s-celles

doc/source/whatsnew/v0.20.0.txt

@@ -49,11 +49,9 @@ Other enhancements
 ^^^^^^^^^^^^^^^^^^
 
 - ``pd.read_excel`` now preserves sheet order when using ``sheetname=None`` (:issue:`9930`)
-<<<<<<< HEAD
-
 - ``pd.cut`` and ``pd.qcut`` now support datetime64 and timedelta64 dtypes (issue:`14714`)
-=======
 - ``Series`` provides a ``to_excel`` method to output Excel files (:issue:`8825`)
+
 .. _whatsnew_0200.api_breaking:
 
 Backwards incompatible API changes