Example in 'Essential Basic Functionality' section of Docs incorrect
http://pandas.pydata.org/pandas-docs/dev/basics.html#function-application

The example in line [109](under) of this section does not produce the expected results, as the text indicates the goal of the exercise is to "extract the date where the maximum value for each column occurred". To do this we simply need:

tsdf.idxmax()

Perhaps replacing it with another example, or at least correcting it, would be beneficial.
