fix advanced.md doc link for openapi-typescript's Readme.md file

[msgadi]

Changes

What does this PR change? Link to any related issue(s).
This PR change is related to fix advanced.md link for openapi-typescript package.

How to Review

How can a reviewer review your changes? What should be kept in mind for this review?
Just check the path of advanced.md which is required to link for openapi-typescript package.

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: eddf48d

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[drwpow]

Thank you!