Update advanced.rst (#34950)

Author: glechic

doc/source/user_guide/advanced.rst

@@ -260,7 +260,9 @@ You don't have to specify all levels of the ``MultiIndex`` by passing only the
 first elements of the tuple. For example, you can use "partial" indexing to
 get all elements with ``bar`` in the first level as follows:
 
-df.loc['bar']
+.. ipython:: python
+
+   df.loc['bar']
 
 This is a shortcut for the slightly more verbose notation ``df.loc[('bar',),]`` (equivalent
 to ``df.loc['bar',]`` in this example).