Revert "docs: revert image 15.3 change until live" (#77977)

Reverts #77941

Author: styfle

errors/next-image-unconfigured-host.mdx

@@ -13,15 +13,7 @@ Add the protocol, hostname, port, and pathname to the `images.remotePatterns` co
 ```js filename="next.config.js"
 module.exports = {
   images: {
-    remotePatterns: [
-      {
-        protocol: 'https',
-        hostname: 'assets.example.com',
-        port: '',
-        pathname: '/account123/**',
-        search: '',
-      },
-    ],
+    remotePatterns: [new URL('https://assets.example.com/account123/**')],
   },
 }
 ```