DOC: Updated docstring for Period class (#53879)

Updated docstring for Period class

Author: rsm-23

pandas/_libs/tslibs/period.pyx

@@ -2674,7 +2674,7 @@ class Period(_Period):
     freq : str, default None
         One of pandas period strings or corresponding objects. Accepted
         strings are listed in the
-        :ref:`offset alias section <timeseries.offset_aliases>` in the user docs.
+        :ref:`period alias section <timeseries.period_aliases>` in the user docs.
         If value is datetime, freq is required.
     ordinal : int, default None
         The period offset from the proleptic Gregorian epoch.