DOC: Fix Error in pandas.Series.last (#33199)

Author: farhanreynaldo

pandas/core/generic.py

@@ -8062,15 +8062,21 @@ def first(self: FrameOrSeries, offset) -> FrameOrSeries:
 
     def last(self: FrameOrSeries, offset) -> FrameOrSeries:
         """
-        Method to subset final periods of time series data based on a date offset.
+        Select final periods of time series data based on a date offset.
+
+        When having a DataFrame with dates as index, this function can
+        select the last few rows based on a date offset.
 
         Parameters
         ----------
         offset : str, DateOffset, dateutil.relativedelta
+            The offset length of the data that will be selected. For instance,
+            '3D' will display all the rows having their index within the last 3 days.
 
         Returns
         -------
-        subset : same type as caller
+        Series or DataFrame
+            A subset of the caller.
 
         Raises
         ------