DOC: DataFrame.to_html() documentation isn't rendering properly
The arguments are showing in two lists.

[Link](http://pandas.pydata.org/pandas-docs/stable/generated/pandas.DataFrame.to_html.html)

I'll fix this myself, if somebody doesn't get to it quickly.  It's good for a first PR, and I've done a couple PRs myself.

![image](https://cloud.githubusercontent.com/assets/6062071/4747544/1995b8b8-5a5e-11e4-8471-d43dcbd33864.png)

Edit: Removed reference to formatters.
