remove double newline

Co-authored-by: s1099 <[email protected]>

Author: sjalkote

pandas/core/accessor.py

@@ -356,8 +356,6 @@ def __init__(self, pandas_obj):
 
         def sum(self):
             return self._obj.sum()
-
-
 Back in an interactive IPython session:
 
 .. code-block:: ipython