docs: Explicit the usage of NIR compared to TGSI & Make a parallel between VirGL and Venus
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First commit: Make it clear that they are both doing the same thing but using one or the other has implications (we can't use NIR to communicate with virtio-gpu for instance as there is no API/ABI stability guarantees) Also define what NIR means for curious people and expand the ALU acronym when first mentioned.
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Second commit Make it clear that these two drivers are related and update the documentation to mention that it is using VirtIO-GPU.