Play the mob animation after setting it in Your first 2D game (#10752)

getting_started/first_2d_game/04.creating_the_enemy.rst

@@ -87,6 +87,7 @@ and randomly choose one of the three animation types:
     func _ready():
         var mob_types = Array($AnimatedSprite2D.sprite_frames.get_animation_names())
         $AnimatedSprite2D.animation = mob_types.pick_random()
+        $AnimatedSprite2D.play()
 
  .. code-tab:: csharp
 
@@ -106,6 +107,8 @@ to select one of these animation names at random. Meanwhile, in the C# code, we
 between ``0`` and ``2`` to select one of these names from the list (array indices start at ``0``). The 
 expression ``GD.Randi() % n`` selects a random integer between ``0`` and ``n-1``.
 
+Finally, we call ``play()`` to start playing the chosen animation.
+
 The last piece is to make the mobs delete themselves when they leave the screen.
 Connect the ``screen_exited()`` signal of the ``VisibleOnScreenNotifier2D`` node
 to the ``Mob`` and add this code: