fix: use warning admonition (#1435)

Author: MatanBobi

docs/ecosystem-jest-native.mdx

@@ -4,6 +4,20 @@ title: jest-native
 sidebar_label: jest-native
 ---
 
+:::warning
+
+**This package is deprecated and is no longer actively maintained.**
+
+We encourage you to migrate to React Native Testing Library, v12.4 or later,
+which includes modern
+[built-in Jest matchers](https://callstack.github.io/react-native-testing-library/docs/api/jest-matchers)
+based on the matchers for this repository. The migration process should be
+relatively straightforward, we have a
+[migration guide](https://callstack.github.io/react-native-testing-library/docs/migration/jest-matchers)
+available.
+
+:::
+
 [`Jest Native`](https://github.com/testing-library/jest-native) is a companion
 library for `React Native Testing Library` that provides custom element matchers
 for Jest.
@@ -30,14 +44,6 @@ expect(queryByTestId('not-empty')).not.toBeEmpty()
 > `getByTestId`). Otherwise the `get*` function could throw an error before your
 > assertion.
 
-> [!CAUTION]
-> **This package is deprecated and is no longer actively maintained.**
-> 
-> We encourage you to migrate to React Native Testing Library, v12.4 or later, which includes modern [built-in Jest matchers](https://callstack.github.io/react-native-testing-library/docs/api/jest-matchers) based on the matchers for this repository.
->
-> The migration process should be relatively straightforward, we have a [migration guide](https://callstack.github.io/react-native-testing-library/docs/migration/jest-matchers) available.
-
-
 Check out
 [Jest Native's documentation](https://github.com/testing-library/jest-native)
 for a full list of available matchers.