docs: fix pytorch anchor link: PYTORCH_CUDA_ALLOC_CONF->PYTORCH_ALLOC_CONF

[terrykong]

https://docs.pytorch.org/docs/stable/notes/cuda.html#optimizing-memory-usage-with-pytorch-alloc-conf

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Summary by CodeRabbit

• Documentation

  • Reflowed content in README for improved readability.
  • Updated formatting in documentation files.

• Style

  • Minor whitespace adjustments in configuration examples.

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📝 Walkthrough

Walkthrough

Minor formatting and whitespace adjustments across documentation and configuration files without altering functionality or content meaning.

Changes

Cohort / File(s)	Summary
Documentation files README.md, docs/about/tips-and-tricks.md	Line reflow in max_split_size_mb description and whitespace adjustment in Memory Fragmentation section; content unchanged.
Configuration files examples/configs/dpo.yaml	No semantic modification; formatting adjustment only.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Test Results For Major Changes	✅ Passed	PR contains only minor documentation updates and formatting fixes with no observable functional modifications, meeting the check criteria.
Title check	✅ Passed	The title accurately describes the main change: updating a PyTorch documentation anchor link from PYTORCH_CUDA_ALLOC_CONF to PYTORCH_ALLOC_CONF, which aligns with the PR objectives to fix an outdated PyTorch documentation link.

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✨ Finishing touches

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