Confusing docstring
I just came across this one while browsing the code.
Maybe this should be Index.intersection in the docstring ?

```
 def intersection(self, other):
        """
        Specialized intersection for DatetimeIndex objects. May be much faster
        than Index.union

        Parameters
        ----------
        other : DatetimeIndex or array-like

        Returns
        -------
        y : Index or DatetimeIndex
        """``

```
