Incorrect Statement in Docs for Advanced indexing with hierarchical index
See: http://pandas.pydata.org/pandas-docs/dev/indexing.html#advanced-indexing-with-hierarchical-index, where it states:
"The following does not work, and it’s not clear if it should or not:"

```
>>> df.ix[['bar', 'qux']]
```

That does work. See for example:

```
In [65]:

wp = pd.Panel(np.random.randn(2, 4, 5), items=['Item1', 'Item2'],
               minor_axis=pd.date_range('1/1/2000', periods=5),
               major_axis=['A', 'B', 'C', 'D'])
print wp.to_frame().ix[["A", "B"]]
                     Item1     Item2
major minor                         
A     2000-01-01 -1.938712  0.404485
      2000-01-02  1.180799  0.124615
      2000-01-03 -0.304632 -1.238341
      2000-01-04  1.215016  1.117624
      2000-01-05 -1.274482  0.348929
B     2000-01-01  0.622100  0.506472
      2000-01-02  0.108105  1.562588
      2000-01-03 -0.277282 -1.766601
      2000-01-04 -0.313015  0.004508
      2000-01-05 -0.553452 -0.600046

[10 rows x 2 columns]
```
