Move whatsnew BQ Enhancements -> Enhancements

Author: necnec

doc/source/whatsnew/v0.20.0.txt

@@ -31,6 +31,7 @@ Other enhancements
 ^^^^^^^^^^^^^^^^^^
 
 - ``pd.read_excel`` now preserves sheet order when using ``sheetname=None`` (:issue:`9930`)
+- ``pd.io.gbq.read_gbq`` method now allows query configuration preferences
 
 
 .. _whatsnew_0200.api_breaking:
@@ -84,9 +85,4 @@ Performance Improvements
 Bug Fixes
 ~~~~~~~~~
 
-.. _whatsnew_0200.gbq:
 
-Google BigQuery Enhancements
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-
-- The :func:`read_gbq` method now allows query configuration preferences