Update Nvidia module with an OSVDB ref

The paper is really good, but could use a more traditional reference.

[See rapid7#4884]

Author: Tod Beardsley

modules/exploits/windows/misc/nvidia_mental_ray.rb

@@ -31,7 +31,8 @@ def initialize(info = {})
         ],
       'References' =>
         [
-          [ 'URL', 'http://revuln.com/files/ReVuln_NVIDIA_mental_ray.pdf' ]
+          [ 'URL', 'http://revuln.com/files/ReVuln_NVIDIA_mental_ray.pdf' ],
+          [ 'OSVDB', '100827' ]
         ],
       'Stance' => Msf::Exploit::Stance::Aggressive,
       'Platform'       => 'win',