Fix Introduction.html.tpl


![screenshot from 2014-08-13 10 29 11](https://cloud.githubusercontent.com/assets/10982/3900591/e4fa7598-2291-11e4-8d18-16eb80412a3f.png)
Hi,

I found this problem when reviewing the code documentation. Especially when there are params on the description. The $param['name'] seems to be missing and frapi stops to function properly since the param['name'] is not set or missing.

This update will try to fix that.

This is the 4th Frapi installation I made, 2 of them are payment heavy API. Very good API core solution that fits my need.