docs: fix Supabase Storage example anchor links

[Rohan170603]

✅ Checklist

• I have followed every step in the contributing guide.
• The PR title follows the convention.
• I ran and tested the code works.

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Testing

• Ran the documentation site locally.
• Verified both links in the Overview section navigate to the correct sections.
• Ran npm run lint (existing unrelated warning only).

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Changelog

Updated the overview links in the Supabase Storage upload guide to use the current heading anchors, fixing navigation to both examples.

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Screenshots

N/A (documentation link fix)

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[devin-ai-integration]

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Review failed

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 2dee3bd2-9574-4c56-a67d-a6d545129d96

📥 Commits

Reviewing files that changed from the base of the PR and between c01a4f1 and 29e366e.

📒 Files selected for processing (1)

• docs/guides/examples/supabase-storage-upload.mdx

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Walkthrough

Updated two links in the Supabase storage upload guide. The links now use relative anchors that target the current Supabase client and AWS S3 section headings.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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