Import Doc: Missing Naming Version description

**Your Godot version:** 4.2

**Issue description:** glTF section does not describe _Naming Version_.

**URL to the documentation page:** https://docs.godotengine.org/en/stable/tutorials/assets_pipeline/importing_3d_scenes/import_configuration.html#using-the-import-dock

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