Put an isometric autotile templates on the Using TileMaps page.

[ShatReal]

Your Godot version: 3.4.2

Issue description: The page doesn't have one. I made one (3x3 minimal). Please tell me if this one is acceptable.

URL to the documentation page (if already existing): https://docs.godotengine.org/en/latest/tutorials/2d/using_tilemaps.html

[ghost]

I made a 2x2 version

[ghost]

Actually, I think these may be better

[ghost]

Closed by #6164

[Calinou]

Reopening, as the associated pull request hasn't been merged yet.

[ghost]

the page has been split into two, this issue isn't relevant anymore