Fix PR07,RT03,SA01 errors for Index.join

ci/code_checks.sh

@@ -94,7 +94,6 @@ if [[ -z "$CHECK" || "$CHECK" == "docstrings" ]]; then
         -i "pandas.Index.get_indexer_for PR01,SA01" \
         -i "pandas.Index.get_indexer_non_unique PR07,SA01" \
         -i "pandas.Index.get_loc PR07,RT03,SA01" \
-        -i "pandas.Index.join PR07,RT03,SA01" \
         -i "pandas.Index.names GL08" \
         -i "pandas.Index.putmask PR01,RT03" \
         -i "pandas.Index.ravel PR01,RT03" \

pandas/core/indexes/base.py

@@ -4234,16 +4234,32 @@ def join(
         Parameters
         ----------
         other : Index
+            An Index object to join with the original Index.
         how : {'left', 'right', 'inner', 'outer'}
+            Specifies the type of join to perform. It can take one of the following
+            values.
+            * left : Perform a left join, preserving the order of the original Index.
+            * right : Perform a right join.
+            * inner : Perform an inner join, retaining only the intersection of the
+              indices.
+            * outer : Perform an outer join, retaining all elements from both indices.
         level : int or level name, default None
+            Specifies the level of a multi-index, if applicable.
         return_indexers : bool, default False
+            A boolean indicating whether to return indexers.
         sort : bool, default False
             Sort the join keys lexicographically in the result Index. If False,
             the order of the join keys depends on the join type (how keyword).
 
         Returns
         -------
         join_index, (left_indexer, right_indexer)
+            The resulting Index after performing the join operation.
+
+        See Also
+        --------
+        Index.intersection : Form the intersection of two Index objects.
+        Index.append : Append a collection of Index options together.
 
         Examples
         --------