docs: add note about early hints and nginx

packages/schema/src/config/experimental.ts

@@ -83,7 +83,11 @@ export default defineUntypedSchema({
     /** Enable cross-origin prefetch using the Speculation Rules API. */
     crossOriginPrefetch: false,
 
-    /** Write early hints when using node server */
+    /** 
+     * Write early hints when using node server.
+     *
+     * @note If you are using Nginx, set the value to `false`. Nginx does not support 103 Early hints in the current version.
+     */
     writeEarlyHints: true
   }
 })