Document that compiler.extends can be an array

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compiler.extends extends

✅ Viability Checklist

• This wouldn't be a breaking change in existing TypeScript/JavaScript code
• This wouldn't change the runtime behavior of existing JavaScript code
• This could be implemented without emitting different JS based on the types of the expressions
• This isn't a runtime feature (e.g. library functionality, non-ECMAScript syntax with JavaScript output, new syntax sugar for JS, etc.)
• This isn't a request to add a new utility type: https://github.com/microsoft/TypeScript/wiki/No-New-Utility-Types
• This feature would agree with the rest of our Design Goals: https://github.com/Microsoft/TypeScript/wiki/TypeScript-Design-Goals

⭐ Suggestion

After merging https://github.com/microsoft/TypeScript/pull/50403, the docs at https://www.typescriptlang.org/tsconfig/#extends haven't been updated to indicate that extends may be an array.

📃 Motivating Example

Users may only learn that extends may be an array if they find the PR above.

从 tsconfig 的 compilerOptions.extends 参考页面开始，并查看链接的 TypeScript PR #50403 以了解受支持的行为。更新文档，说明 extends 可以是数组，然后验证渲染后的页面是否清晰地反映了这一点，同时不更改其他配置说明。