Fix LoRA finetune single device link in README

[alexrs]

Context

• The link to the LoRA recipe in the Single device case in the README pointed to recipes/lora_finetune_distributed.py instead of recipes/lora_finetune_single_device.py.

Changelog

• Fix LoRA finetune single device link in README

Test plan

• When I click on the link, it opens recipes/lora_finetune_single_device.py.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/torchtune/786

• 📄 Preview Python docs built from this PR

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✅ No Failures

As of commit d80c138 with merge base 6a36b52 ():
💚 Looks good so far! There are no failures yet. 💚

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[RdoubleA]

Appreciate you for catching and fixing this :) just need to sign the CLA

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