docs: add descriptive labels to PyTorch resource links in README

[thayeylolu]

Description

This PR improves the README by replacing two bare URLs with descriptive link text, making the document easier to scan and more user-friendly.

Changes

• https://dev-discuss.pytorch.org/ → "PyTorch Dev-Discussions forum"
• https://docs.pytorch.org/tutorials/ → "Official PyTorch Tutorials website"

Motivation

• Bare URLs in documentation can be harder to read and don't convey what the link actually points to at a glance. Adding short descriptive text gives readers context before they click.

Type of change

• Documentation update
• Bug fix
• New feature
• Breaking change

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/tutorials/3926

• 📄 Preview Python docs built from this PR

Note: Links to docs will display an error until the docs builds have been completed.

❗ 1 Active SEVs

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• [ROCm] MI350 CI runner label rename: rebase PRs using old linux.rocm.gpu.gfx950.* labels

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