Document that compiler.extends can be an array · Microsoft/TypeScript#62915

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DocsHelp Wanted

Description

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.

Tech stack: typescript
Domain: documentation
Issue type: documentation
Difficulty: 1
Estimated time: under 1 hour
Activity status: fresh
Clarity: clear
Prerequisites: Familiarity with TypeScript's tsconfig.json documentation
Newbie friendliness: 95
Research direction: The issue is to update the TypeScript documentation at https://www.typescriptlang.org/tsconfig/#extends to indicate that the 'extends' field in tsconfig.json can accept an array of strings. This was enabled by PR #50403. The change is a simple documentation edit; examine the current page and add a note that 'extends' also accepts an array of paths.