Some internal classes link to official Godot docs

[KANAjetzt]

https://wiki.godotmodding.com/api/mod_loader_mod/

ModData, for example, links to https://docs.godotengine.org/en/stable/classes/class_moddata.html, it would be nice if we could link to a wiki page with a reference for that resource type.

[Qubus0]

ah well, slight oversight

gmlwiki/xml_to_md.py

Lines 98 to 99 in 6b82fc6

	if "ModLoader" in class_name:
	return f'{pascal_to_snake_case(class_name)}.md{anchor}'