|obj||The spawned object to be unspawned.|
This takes an object that has been spawned and un-spawns it.
The object will be removed from clients that it was spawned on, or the custom spawn handler function on the client will be called for the object.
Unlike when calling NetworkServer.Destroy(), on the server the object will NOT be destroyed. This allows the server to re-use the object, even spawn it again later.