refactor(docs): consolidate warning message for ESLint Legacy Config in presets documentation

Author: Rel1cx

website/content/docs/presets.mdx

@@ -55,9 +55,7 @@ The following presets are available in `@eslint-react/eslint-plugin`:
 
   <Tab value="Legacy Config">
 
-    <Callout type="info">These presets are for ESLint Legacy Config (`.eslintrc.*`) only.</Callout>
-
-    <Callout type="warn">This config system is deprecated and not enabled by default in ESLint >= 9.0.0.</Callout>
+    <Callout type="warn">These presets are for ESLint Legacy Config (`.eslintrc.*`) only. The Legacy Config is deprecated and not enabled by default in ESLint >= 9.0.0.</Callout>
 
     ## Bare Bones