[Docs] Wrong Example Path

https://sbox.game/dev/doc/editor/model-editor/

References an example model at "sbox\game\addons\citizen\Assets\models\citizen\citizen.vmdl", but it seems that path is outdated. 

The path on my machine is "sbox\addons\citizen\Assets\models\citizen\citizen.vmdl". There is no "game" folder in the "sbox" root.

Thanks - have updated it