DOC: fix SA01 for pandas.MultiIndex.nlevels (pandas-dev#58976)

Author: tuhinsharma121

ci/code_checks.sh

@@ -84,7 +84,6 @@ if [[ -z "$CHECK" || "$CHECK" == "docstrings" ]]; then
         -i "pandas.MultiIndex.get_loc_level PR07" \
         -i "pandas.MultiIndex.levshape SA01" \
         -i "pandas.MultiIndex.names SA01" \
-        -i "pandas.MultiIndex.nlevels SA01" \
         -i "pandas.MultiIndex.remove_unused_levels RT03,SA01" \
         -i "pandas.MultiIndex.reorder_levels RT03,SA01" \
         -i "pandas.MultiIndex.set_levels RT03,SA01" \

pandas/core/indexes/multi.py

@@ -1031,6 +1031,13 @@ def nlevels(self) -> int:
         """
         Integer number of levels in this MultiIndex.
 
+        See Also
+        --------
+        MultiIndex.levels : Get the levels of the MultiIndex.
+        MultiIndex.codes : Get the codes of the MultiIndex.
+        MultiIndex.from_arrays : Convert arrays to MultiIndex.
+        MultiIndex.from_tuples : Convert list of tuples to MultiIndex.
+
         Examples
         --------
         >>> mi = pd.MultiIndex.from_arrays([["a"], ["b"], ["c"]])