fix pandas.Series.dt.freq

Author: KatsiarynaDzibrova

pandas/core/indexes/accessors.py

@@ -373,6 +373,36 @@ def to_pydatetime(self) -> Series:
 
     @property
     def freq(self):
+        """
+        Return the frequency object if it is set, otherwise None.
+
+        To learn more about the frequency strings, please see
+        :ref:`this link<timeseries.offset_aliases>`.
+
+        See Also
+        --------
+        DatetimeIndex.freq : Return the frequency object if it is set, otherwise None.
+        PeriodIndex.freq : Return the frequency object if it is set, otherwise None.
+
+        Examples
+        --------
+        >>> datetimeindex = pd.Series(
+        ...     [
+        ...         "2022-02-22 02:22:22-06:00",
+        ...         "2022-02-22 03:22:22-06:00",
+        ...         "2022-02-22 04:22:22-06:00",
+        ...         "2022-02-22 05:22:22-06:00",
+        ...         "2022-02-22 06:22:22-06:00",
+        ...         "2022-02-22 07:22:22-06:00",
+        ...         "2022-02-22 08:22:22-06:00",
+        ...         "2022-02-22 09:22:22-06:00",
+        ...         "2022-02-22 10:22:22-06:00",
+        ...         "2022-02-22 11:22:22-06:00",
+        ...     ]
+        ... )
+        >>> datetimeindex.freq
+        <H>
+        """
         return self._get_values().inferred_freq
 
     def isocalendar(self) -> DataFrame: