Document that compiler.extends can be an array

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compiler.extends extends

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

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

Research direction: Update the tsconfig.json documentation at https://www.typescriptlang.org/tsconfig/#extends to mention that the extends field can be an array, as implemented in PR #50403.
Tech stack: typescript
Domain: documentation
Issue type: Documentation
Difficulty: 1
Estimated time: Under 1 hour
Activity status: Active
Clarity: Clear
Prerequisites: Git
Newbie friendliness: 90