DOC: add SA01 for pandas.Timestamp.as_unit

Author: tuhinsharma121

pandas/_libs/tslibs/timestamps.pyx

@@ -1115,6 +1115,14 @@ cdef class _Timestamp(ABCTimestamp):
         -------
         Timestamp
 
+        See Also
+        --------
+        Timestamp.asm8 : Return numpy datetime64 format in nanoseconds.
+        Timestamp.to_pydatetime : Convert Timestamp object to a native
+            Python datetime object.
+        to_timedelta : Convert argument into timedelta object,
+            which can represent differences in times.
+
         Examples
         --------
         >>> ts = pd.Timestamp('2023-01-01 00:00:00.01')