message: docs(Form): improve required description
diff: @@ -509,7 +509,7 @@ export default {
  | Key | Description | Type |
  | --- | --- | --- |
  -| required | Whether to be a required field | _boolean_ |
  +| required | Whether to be a required field, the value is not allowed to be empty string, empty array, `undefined`, `null` | _boolean_ |
  | message | Error message | _string \| (value, rule) => string_ |
  | validator | Custom validator | _(value, rule) => boolean \| string \| Promise_ |
  | pattern | Regex pattern | _RegExp_ |
  