Fix broken URL in openapi-typescript/README

[asvishnyakov]

Changes

Fixed broken link to advanced.md in README

How to Review

Checklist

• Unit tests updated
• docs/ updated (if necessary)
• pnpm run update:examples run (only applicable for openapi-typescript)

[changeset-bot]

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Latest commit: 3756cdd

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[drwpow]

Thank you!