Update finetuning_llama3_8B_ptl_lora.rst

[jimburtoft]

Update lightning version in docs to match the version is in the wget https://raw.githubusercontent.com/aws-neuron/neuronx-distributed/main/examples/training/llama/requirements_ptl.txt
file.

AWS email alias: [email protected]

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@erickson-doug
Note: For trivial changes, you only need @erickson-doug's approval. He will merge your content once he's confirmed the fixes on staging.

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• [ x] I've confirmed that the contributions in this PR meet the current AWS Neuron writing guidelines.
• [ x] I've confirmed that the documentation submitted is technically correct to the best of my knowledge.
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[jimburtoft]

You may want to validate some other mentions:

"lightning version 2.1.0" site:https://awsdocs-neuron.readthedocs-hosted.com