fix typo

Author: Moons08

pandas/core/indexes/base.py

@@ -1370,8 +1370,8 @@ def rename(self, name, inplace=False):
         ...                                  names=['foo', 'bar'])
         >>> idx.rename(['bar', None])
         MultiIndex(levels=[[1, 2], ['one', 'two']],
-                    labels=[[0, 0, 1, 1], [0, 1, 0, 1]],
-                    names=['bar', None])
+                   labels=[[0, 0, 1, 1], [0, 1, 0, 1]],
+                   names=['bar', None])
         >>> idx.rename(['bar'])
         Traceback (most recent call last):
         ValueError: Length of names must match number of levels in MultiIndex.