DOC: Enforce Numpy Docstring Validation for pandas.Index.sliece_indexer (#58490)

* DOC: add PR07,RT03 in pandas.Index.slice_indexer

* DOC: add SA01 in pandas.Index.slice_indexer

* DOC: remove pandas.Index.slice_indexer

Author: tuhinsharma121

ci/code_checks.sh

@@ -101,7 +101,6 @@ if [[ -z "$CHECK" || "$CHECK" == "docstrings" ]]; then
         -i "pandas.Index.names GL08" \
         -i "pandas.Index.putmask PR01,RT03" \
         -i "pandas.Index.ravel PR01,RT03" \
-        -i "pandas.Index.slice_indexer PR07,RT03,SA01" \
         -i "pandas.Index.str PR01,SA01" \
         -i "pandas.Index.view GL08" \
         -i "pandas.Int16Dtype SA01" \

pandas/core/indexes/base.py

@@ -6342,19 +6342,26 @@ def slice_indexer(
         end : label, default None
             If None, defaults to the end.
         step : int, default None
+            If None, defaults to 1.
 
         Returns
         -------
         slice
+            A slice object.
 
         Raises
         ------
         KeyError : If key does not exist, or key is not unique and index is
             not ordered.
 
+        See Also
+        --------
+        Index.slice_locs : Computes slice locations for input labels.
+        Index.get_slice_bound : Retrieves slice bound that corresponds to given label.
+
         Notes
         -----
-        This function assumes that the data is sorted, so use at your own peril
+        This function assumes that the data is sorted, so use at your own peril.
 
         Examples
         --------