"Size and Anchors" UI tutorial still uses margins

[MichaelJBerk]

Your Godot version:
4.2

Issue description:
The "Size and Anchors" tutorial page still references the Margin properties on controls, despite margins being replaced by
anchor offsets in Godot 4

URL to the documentation page:
https://docs.godotengine.org/en/stable/tutorials/ui/size_and_anchors.html

[AThousandShips]

This page is still listed as outdated so it hasn't been updated yet

[AThousandShips]

It is in fact already tracked on the tracker:

• Documentation pages to add or update for Godot 4.0 #5121

Consolidating there, thank you for your report

This is being improved in:

• Update size and anchors tutorial #8855