DOC: Enforce Numpy Docstring Validation (Issue #59458) (#59590)

* adding docstring for pandas.Timestamp.day property

* fixing type annotation

Author: ankit-dhokariya

Diff for: ci/code_checks.sh

@@ -168,7 +168,6 @@ if [[ -z "$CHECK" || "$CHECK" == "docstrings" ]]; then
         -i "pandas.TimedeltaIndex.nanoseconds SA01" \
         -i "pandas.TimedeltaIndex.seconds SA01" \
         -i "pandas.TimedeltaIndex.to_pytimedelta RT03,SA01" \
-        -i "pandas.Timestamp.day GL08" \
         -i "pandas.Timestamp.fold GL08" \
         -i "pandas.Timestamp.hour GL08" \
         -i "pandas.Timestamp.max PR02" \

Diff for: pandas/_libs/tslibs/timestamps.pyx

@@ -961,6 +961,29 @@ cdef class _Timestamp(ABCTimestamp):
         """
         return ((self.month - 1) // 3) + 1
 
+    @property
+    def day(self) -> int:
+        """
+        Return the day of the Timestamp.
+
+        Returns
+        -------
+        int
+            The day of the Timestamp.
+
+        See Also
+        --------
+        Timestamp.week : Return the week number of the year.
+        Timestamp.weekday : Return the day of the week.
+
+        Examples
+        --------
+        >>> ts = pd.Timestamp("2024-08-31 16:16:30")
+        >>> ts.day
+        31
+        """
+        return super().day
+
     @property
     def week(self) -> int:
         """