updated index.md to fix display bug

fixed display bug in http python page of worker/languages that was causing </ul> and </li> tags to show up in the documentation http://dev.iron.io/worker/languages/python/.

screenshot of original:
https://www.dropbox.com/s/9gjchgr617q6zfy/Screenshot%202014-10-17%2015.59.13.png?dl=0

fixed:
https://www.dropbox.com/s/ej2zqh8785mfbqn/Screenshot%202014-10-17%2015.59.45.png?dl=0