DOC: to_hdf int columns error

Author: jorisvandenbossche

doc/source/whatsnew/v0.13.0.txt

@@ -359,7 +359,7 @@ HDFStore API Changes
   .. ipython:: python
 
      path = 'test.h5'
-     df = DataFrame(randn(10,2))
+     df = DataFrame(randn(10,2), columns=['a','b'])
      df.to_hdf(path,'df_table',format='table')
      df.to_hdf(path,'df_table2',append=True)
      df.to_hdf(path,'df_fixed')