Update errormessage.mdx

added missing colon

Author: N3M0dropserver

src/content/docs/useformstate/errormessage.mdx

@@ -161,7 +161,7 @@ import { ErrorMessage } from '@hookform/error-message';
 
 export default function App() {
   const { register, formState: { errors }, handleSubmit } = useForm({
-    criteriaMode "all"
+    criteriaMode: "all"
   });
   const onSubmit = data => console.log(data);