message: Grammatical mistake fix
  "Actor's" should be "Actors"
diff: @@ -41,7 +41,7 @@ fn random_vec(max_magnitude: f32) -> Vector2 {
  }
  /// *********************************************************************
  -/// Now we define our Actor's.
  +/// Now we define our Actors.
  /// An Actor is anything in the game world.
  /// We're not *quite* making a real entity-component system but it's
  /// pretty close. For a more complicated game you would want a
  