type(Form): fix children type error.

Author: jaywcjlove

packages/react-form/src/Form.tsx

@@ -25,7 +25,7 @@ export interface FormState {
 
 export interface FormFieldsProps<T> extends Omit<FormItemProps<T>, 'children'> {
   name?: string;
-  children?: (handle: FormChildrenProps) => JSX.Element;
+  children?: ((handle: FormChildrenProps) => JSX.Element) | JSX.Element;
   help?: React.ReactNode;
   labelFor?: string;
   inline?: boolean;