[Core] [Docs] Clarify how fractional GPU is handled by Ray Core scheduler

[zhe-thoughts]

Description

It's becoming a common question how Ray Core schedule Tasks / Actors to meet the fractional GPU specification: https://docs.ray.io/en/master/ray-core/tasks/using-ray-with-gpus.html#fractional-gpus

We should clarify in docs that this is done by bin packing onto individual GPU devices (with a simple example)

Link

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[zhe-thoughts]

Still valid issue

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[jjyao]

It's mentioned in the latest doc.