fix(docs): update StructuredData example link to a correct path

[bossm0n5t3r]

Motivation and Context

• The StructuredData example link was pointing to an incorrect path, making it difficult for users to access the corresponding example code.
• This change updates the link to the correct path by referencing the proper directory structure at https://github.com/JetBrains/koog/tree/develop/examples to ensure users can easily navigate to the StructuredData example implementation.

Breaking Changes

• None - this change only includes documentation link path corrections.

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Type of the changes

• [ ] New feature (non-breaking change which adds functionality)
• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [x] Documentation update
• [ ] Tests improvement
• [ ] Refactoring

Checklist

• [x] The pull request has a description of the proposed change
• [x] I read the Contributing Guidelines before opening the pull request
• [x] The pull request uses develop as the base branch
• [ ] Tests for the changes have been added
• [x] All new and existing tests passed

Additional steps for pull requests adding a new feature

• [ ] An issue describing the proposed change exists
• [ ] The pull request includes a link to the issue
• [ ] The change was discussed and approved in the issue
• [x] Docs have been added / updated