SkeletonModification2DFABRIK documentation page says that it supports angle constrains, but there is no way to set them

[linuxhuskarl]

Your Godot version: 4.3

Issue description: As in the title. I'd say either correct the documentation, or expose the said functionality. See the screenshot below for confirmation, that there is no way to set angle constrains.

URL to the documentation page: SkeletonModification2DFABRIK

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and contributing to the class reference here: https://docs.godotengine.org/en/stable/community/contributing/updating_the_class_reference.html