Fix name collisions documentation/tutorial.md

[lopezac]

Names collisions should be resolved at the level of public interface, not implementation. Here it exports directly FooCard, but it should export Card as FooCard, the same with FooThumbnail. Source: https://feature-sliced.design/docs/reference/public-api#resolution-of-collisions

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[unordinarity]

@lopezac that's a good point, thank you for noticing