[#60699076] Fixes the email address on the "become a vendor" page.

Fixes the email address on the "become a vendor" page of the knowledge base. It is now "support@allplayers.com" instead of "support@allplayer.com".

![1](https://f.cloud.github.com/assets/2251119/1532863/d4b04b0e-4c7c-11e3-871b-5b6f7abc124e.png)