Update custom_matchers new interface

Author: oiagorodrigues

exercises/03.assertions/01.solution.custom-matchers/README.mdx

@@ -34,25 +34,13 @@ interface CustomMatchers<MatcherResult = any> {
 }
 
 declare module 'vitest' {
-	interface Assertion<T = any> extends CustomMatchers<T> {}
-	interface MatchersDeclaration extends CustomMatchers {}
+	interface Matchers<T> extends CustomMatchers<T> {}
 }
 ```
 
-There are two interfaces from `vitest` that I extend using module augmentgation:
-
-- `Assertion<T>`, which controls the matchers returned by calling `expect()`;
-- `MatchersDeclaration`, which annotates the matcher declarations passed to `expect.extend()`.
-
-<callout-info>Since Vitest 3.2, you can extend the `Matchers` interface to have type-safe assertions in `expect.extend`, `expect().*` and `expect.*` methods at the same time.</callout-info>
+This is the interface from `vitest` that I extend using module augmentation:
 
-```diff ts filename=vitest.setup.ts add=3 remove=2,3 highlight=3
-declare module 'vitest' {
--	interface Assertion<T = any> extends CustomMatchers<T> {}
--	interface MatchersDeclaration extends CustomMatchers {}
-+	interface Matchers<T> extends CustomMatchers {}
-}
-```
+- `Matchers<T>`, which controls the matchers returned by calling `expect()` and annotates the matcher declarations passed to `expect.extend()`.
 
 This is enough for the `.toMatchSchema()` custom matcher to be recognized by TypeScript: