DOC: fix SA01 for pandas.Timedelta.as_unit (#59030)

Author: tuhinsharma121

ci/code_checks.sh

@@ -211,7 +211,6 @@ if [[ -z "$CHECK" || "$CHECK" == "docstrings" ]]; then
         -i "pandas.Series.to_frame SA01" \
         -i "pandas.Series.to_markdown SA01" \
         -i "pandas.Series.update PR07,SA01" \
-        -i "pandas.Timedelta.as_unit SA01" \
         -i "pandas.Timedelta.asm8 SA01" \
         -i "pandas.Timedelta.ceil SA01" \
         -i "pandas.Timedelta.components SA01" \

pandas/_libs/tslibs/timedeltas.pyx

@@ -1731,6 +1731,12 @@ cdef class _Timedelta(timedelta):
         -------
         Timedelta
 
+        See Also
+        --------
+        Timedelta : Represents a duration, the difference between two dates or times.
+        to_timedelta : Convert argument to timedelta.
+        Timedelta.asm8 : Return a numpy timedelta64 array scalar view.
+
         Examples
         --------
         >>> td = pd.Timedelta('1001ms')