fix: correct useForm defaultValues type in documentation (react-hook-form#1006)

Author: martinnester

src/content/docs/useform.mdx

@@ -123,7 +123,7 @@ This option allows you to configure the validation strategy before a user submit
 
 This option allows you to configure validation strategy when inputs with errors get re-validated **after** a user submits the form (`onSubmit` event and [`handleSubmit`](/docs/useform/handlesubmit) function executed). By default, re-validation occurs during the input change event.
 
-#### defaultValues: <TypeText>`FieldValues | Promise<FieldValues>`</TypeText> {#defaultValues}
+#### defaultValues: <TypeText>`FieldValues | () => Promise<FieldValues>`</TypeText> {#defaultValues}
 
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