remove redundant whitespace

Author: DaanVanHauwermeiren

pandas/core/indexes/base.py

@@ -4042,7 +4042,7 @@ def drop_duplicates(self, keep='first'):
         Examples
         --------
         Generate an pandas.Index with duplicate values.
-        
+
         >>> idx = pd.Index(['lama', 'cow', 'lama', 'beetle', 'lama', 'hippo'])
 
         With the 'keep' parameter, the selection behaviour of duplicated values