Fix docs for collide and collideHandler

The current docs for [Phaser.Physics.Arcade#collide](http://docs.phaser.io/Phaser.Physics.Arcade.html#collide) and [Phaser.Physics.Ninja#collide](http://docs.phaser.io/Phaser.Physics.Ninja.html#collide) state that the `object1` and `object2` params can be an instance of `Phaser.Tilemap`. The expected type is actually a `Phaser.TilemapLayer`.