A little fix: links referenced in sceneLoader.ts are not found

[drumath2237]

A very little fix.
I found a link in the SceneLoader's error message not found.
So, I fixed from https://doc.babylonjs.com/how_to/load_from_any_file_type to https://doc.babylonjs.com/features/featuresDeepDive/importers/loadingFileTypes

[sebavan]

Thanks !!!

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