Update grammar.html

grammar.html

@@ -362,7 +362,7 @@
   </footer>
 
   <script>
-    const BACKEND_URL = "https://gopalkrushnamahapatra-truewrite-scan.hf.space";
+    const BACKEND_URL = "https://gopalkrushnamahapatra-truewrite-scan-backend.hf.space";
     const token = localStorage.getItem("truewriteToken");
     const user = localStorage.getItem("truewriteUser");
     if (!token || !user) {