Update grok-x-ai.mdx

Author: A-Najmabadi

src/pages/ai/grok-x-ai.mdx

@@ -44,6 +44,7 @@ import Head from "next/head";
     {text: <Important>x-ai/grok-3-mini-beta</Important>,},
     {text: <Important>x-ai/grok-3-beta</Important>,},
     {text: <Important>x-ai/grok-4</Important>,},
+    {text: <Important>x-ai/grok-code-fast-1</Important>,},
   ].map((item, index) => (
     <li
       key={index}