fix #987

Author: bluebill1049

src/content/docs/usewatch.mdx

@@ -123,7 +123,9 @@ function Child({ control }) {
 
 function App() {
   const { register, control } = useForm({
-    firstName: "test",
+    defaultValues: {
+      firstName: "test",
+    }
   })
 
   return (