Remove merge from scene from your first 3D game

(cherry picked from commit 16f06a9277)

getting_started/first_3d_game/09.adding_animations.rst

@@ -245,16 +245,10 @@ node structure, you can copy them to different scenes.
 For example, both the *Mob* and the *Player* scenes have a *Pivot* and a
 *Character* node, so we can reuse animations between them.
 
-We're going to duplicate the animation using a feature called "merge from
-scene".
-
-Open the *Mob* scene, right-click on the *Mob* node and select *Merge From
-Scene*.
-
-|image23|
-
-Double-click ``Player.tscn`` to open it and import the *AnimationPlayer*. That's
-it; all monsters will now play the float animation.
+Open the *Mob* scene, select the animation player node and open the float animation.
+Next, click on *Animation -> Copy*. Then Open ``Player.tscn`` and open its animation
+player. Click *Animation -> Paste*. That's it; all monsters will now play the float
+animation.
 
 We can change the playback speed based on the creature's ``random_speed``. Open
 the *Mob*'s script and at the end of the ``initialize()`` function, add the
@@ -562,4 +556,3 @@ And the *Mob*'s script.
 .. |image20| image:: img/09.adding_animations/19.ease_in_second_translation_key.png
 .. |image21| image:: img/09.adding_animations/20.float_animation.gif
 .. |image22| image:: img/09.adding_animations/21.script_icon.png
-.. |image23| image:: img/09.adding_animations/22.merge_from_scene.png