DOC: fix an example which raises an Error in v0.13.0.rst (#54696)

fix example in whatsnew/v0.13.0.rst

Author: natmokval

doc/source/whatsnew/v0.13.0.rst

@@ -537,7 +537,6 @@ Enhancements
   is frequency conversion. See :ref:`the docs<timedeltas.timedeltas_convert>` for the docs.
 
   .. ipython:: python
-     :okexcept:
 
      import datetime
      td = pd.Series(pd.date_range('20130101', periods=4)) - pd.Series(
@@ -546,13 +545,41 @@ Enhancements
      td[3] = np.nan
      td
 
+  .. code-block:: ipython
+
      # to days
-     td / np.timedelta64(1, 'D')
-     td.astype('timedelta64[D]')
+     In [63]: td / np.timedelta64(1, 'D')
+     Out[63]:
+     0    31.000000
+     1    31.000000
+     2    31.003507
+     3          NaN
+     dtype: float64
+
+     In [64]: td.astype('timedelta64[D]')
+     Out[64]:
+     0    31.0
+     1    31.0
+     2    31.0
+     3     NaN
+     dtype: float64
 
      # to seconds
-     td / np.timedelta64(1, 's')
-     td.astype('timedelta64[s]')
+     In [65]: td / np.timedelta64(1, 's')
+     Out[65]:
+     0    2678400.0
+     1    2678400.0
+     2    2678703.0
+     3          NaN
+     dtype: float64
+
+     In [66]: td.astype('timedelta64[s]')
+     Out[66]:
+     0    2678400.0
+     1    2678400.0
+     2    2678703.0
+     3          NaN
+     dtype: float64
 
   Dividing or multiplying a ``timedelta64[ns]`` Series by an integer or integer Series