Update README.md

Update README.md

Rename Mistral-RealworldQA-v0.2-7b-SFT-GGUF-unsloth.Q8_0.gguf to Mistral-RealworldQA-v0.2-7b-SFT-Q8_0.gguf

(Trained with Unsloth)

(Trained with Unsloth)

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