message: doc: Add comment about why the test comm mgr device list is static
diff: @@ -14,6 +14,11 @@ use async_std::{
  use lazy_static::lazy_static;
  lazy_static! {
  + // We create device comm manager instances within the buttplug server,
  + // meaning we can't actually store devices within an instance, because we
  + // may not be able to get it back out. The device list is kept as a module
  + // static, so we can add devices without worrying about when/where the comm
  + // manager exists.
  static ref DEVICE_LIST: Arc<Mutex<Vec<Box<dyn ButtplugDeviceImplCreator>>>> = Arc::new(Mutex::new(vec!()));
  }
  