docs: update v9 migration guide for @eslint/js usage (#20540)

DMartens · web-flow · commit 7143dbf99df2 · 2026-03-15T13:46:50.000+01:00
* docs: add @eslint/js removal to migration guide

* docs: move install instructions from v10 to v9 migration guide
diff --git a/docs/src/use/migrate-to-9.0.0.md b/docs/src/use/migrate-to-9.0.0.md
@@ -353,7 +353,7 @@ export default ["eslint:recommended", "eslint:all"];
 
 In ESLint v9.0.0, this format is no longer supported and will result in an error.
 
-**To address:** Use the `@eslint/js` package instead:
+**To address:** Install and use the `@eslint/js` package instead:
 
 ```js
 // eslint.config.js
