fix(doc): pandas-dev#61432 typing

Author: Yi-Fan Wang

pandas/core/frame.py

@@ -9177,11 +9177,11 @@ def groupby(
 
         Parameters
         ----------%s
-        columns : str or object or a list of str
+        columns : label or object or a list of previous
             Column to use to make new frame's columns.
-        index : str or object or a list of str, optional
+        index : label or object or a list of the previous, optional
             Column to use to make new frame's index. If not given, uses existing index.
-        values : str, object or a list of the previous, optional
+        values : label, object or a list of the previous, optional
             Column(s) to use for populating new frame's values. If not
             specified, all remaining columns will be used and the result will
             have hierarchically indexed columns.

pandas/core/indexes/base.py

@@ -1731,10 +1731,16 @@ def name(self) -> Hashable:
         """
         Return Index or MultiIndex name.
 
+        Returns
+        -------
+        label (hashable object)
+            The name of the Index.
+
         See Also
         --------
         Index.set_names: Able to set new names partially and by level.
         Index.rename: Able to set new names partially and by level.
+        Series.name: Corresponding Series property.
 
         Examples
         --------

pandas/core/reshape/pivot.py

@@ -708,11 +708,11 @@ def pivot(
     ----------
     data : DataFrame
         Input pandas DataFrame object.
-    columns : str or object or a list of str
+    columns : label or object or a list of the previous
         Column to use to make new frame's columns.
-    index : str or object or a list of str, optional
+    index : label or object or a list of the previous, optional
         Column to use to make new frame's index. If not given, uses existing index.
-    values : str, object or a list of the previous, optional
+    values : label, object or a list of the previous, optional
         Column(s) to use for populating new frame's values. If not
         specified, all remaining columns will be used and the result will
         have hierarchically indexed columns.