DOC: update docstring in DataFrame.sort_index

Author: ivanovmg

pandas/core/frame.py

@@ -5646,7 +5646,7 @@ def sort_index(
             and 1 identifies the columns.
         level : int or level name or list of ints or list of level names
             If not None, sort on values in specified index level(s).
-        ascending : bool or list of bools, default True
+        ascending : bool or list-like of bools, default True
             Sort ascending vs. descending. When the index is a MultiIndex the
             sort direction can be controlled for each level individually.
         inplace : bool, default False