TileSet tutorial improvements

[KoBeWi]

Your Godot version:
4.2

Issue description:

• TileSet tutorial is missing any information about animated tiles
• The collision shape editing part is partially outdated. There is new expanded mode

URL to the documentation page:

https://docs.godotengine.org/en/stable/tutorials/2d/using_tilesets.html

[jynus]

I would like to do a couple of PRs for this, with this setup, unless someone else is already working on it?

[Infini-Creation]

Not only this page lack about animated tiles feature but also and mainly, it's not a tutorial at all, mostly a tileset features walk-through.

I believe it will benefit for an entire rewrite, setting a clear goal from the very start, going through one feature after another, providing all the needed assets to complete an entire working project.

For instance, at the "merging several atlas into a single atlas" paragraph, the author use an altered color version of the Kenney's tileset without providing it, readers have to do the job themselves (which is far outside the scope of using tileset in Godot by the way.)

In the previous paragraph ("using a collection of scenes"), there is a CPUParticles2D based scene created, added as a tile then nothing more but a mere sentence !

All of these are confusing and quite depressing as this lead to nowhere and don't provide useful knowledge for people who seek for it and don't have already some base to work with.