fix(openapi-typescript): missing jsdocs comment anyof nested schema

[alewin]

Changes

proposal fix for https://github.com/openapi-ts/openapi-typescript/issues/2142 What does this PR change? Link to any related issue(s).

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Checklist

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

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