Art mistake in "Dodge the creeps" first 2d game tutorial

**Your Godot version:**
v3.4.4.stable.mono.official [419e713a2]

**Issue description:**
Hello! I'm following the "dodge the creeps" getting started tutorial, and I'm on the "coding the player" section. I've got to the point where the script switches which animation is playing based on the direction, and mirrors the art vertically or horizontally depending on direction as well. The problem is that the tutorial states that the player should point all 4 cardinal directions while moving, but my player never rotates left or right, only up or down. I believe the issue is that the provided art assets `playerGrey_walk1.png` and `playerGrey_walk2.png` should be rotated 90 degrees, as tutorial states
> We have the "walk" animation, which shows the player walking to the right.

but the art assets point up and are identical to the `..._up` assets provided.

**URL to the documentation page:**
https://docs.godotengine.org/en/stable/getting_started/first_2d_game/03.coding_the_player.html#choosing-animations

I can easily make this change and am happy to contribute it if someone can confirm that that is indeed the way they are supposed to be!