Godot Getting Started Guide - add note to enable "Autoplay on Load" for enemy animated sprite

[IrwinKwan]

Your Godot version:

4.4

Issue description:

In the 2D tutorial, the enemy sprites do not animate unless Autoplay on Load is enabled. It would be good to add an instruction to check that this is enabled.

URL to the documentation page (if already existing):

https://docs.godotengine.org/en/stable/getting_started/first_2d_game/04.creating_the_enemy.html