Doc Bug: FAQ - CAMERA_INFORMATION doc not clear

[hamishwillee]

Bug Page: FAQ · DroneCore Guide

Re

> ### Why is libCURL a dependency?

-libCURL will be required to download the camera definition file which is referenced in [CAMERA_INFORMATION](http://mavlink.org/messages/common#CAMERA_INFORMATION). It might also come in handy whenever any other REST resources are required.       

This needs to be updated because it isn't clear why DroneCore needs CAMERA_INFORMATION

This requires camera plugin - still not open sourced - note, follow up with @julianoes .