message: doc(ExpectAPI): improve doc on extend
diff: @@ -67,7 +67,7 @@ test('numeric ranges', () => {
  });
  ```
  -_Note_: In TypeScript, when using `@types/jest` for example, you can declare the new `toBeWithinRange` matcher like this:
  +_Note_: In TypeScript, when using `@types/jest` for example, you can declare the new `toBeWithinRange` matcher in the imported module like this:
  ```ts
  declare global {
  