DOC: fix parquet example to not use ns

Author: jreback

doc/source/io.rst

@@ -4515,8 +4515,7 @@ See the documentation for `pyarrow <http://arrow.apache.org/docs/python/>`__ and
                       'd': np.arange(4.0, 7.0, dtype='float64'),
                       'e': [True, False, True],
                       'f': pd.date_range('20130101', periods=3),
-                      'g': pd.date_range('20130101', periods=3, tz='US/Eastern'),
-                      'h': pd.date_range('20130101', periods=3, freq='ns')})
+                      'g': pd.date_range('20130101', periods=3, tz='US/Eastern')})
 
    df
    df.dtypes