ch05/07 gpt_to_llama text improvements

[d-kleine]

• fixed typo for correct markdown
• fixed RMSnorm formula according to code (please double check), see https://afterhoursresearch.hashnode.dev/batch-normalization-layer-normalization-and-root-mean-square-layer-normalization-a-comprehensive-guide-with-python-implementations#heading-equation-2
• fixed SwiGLU formula according to code (please double check), see https://kikaben.com/swiglu-2020/#ffn-and-glu-variants
• temp=0 for untrained llama 2 model for reproducibility
• added info that READ permissions for hf token are sufficient to download models

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