Merge pull request #18058 from kveerapen/ant-design/fix-typo-in-form-component

fix typo for form api documentation

components/form/index.en-US.md

@@ -93,7 +93,7 @@ If the form has been decorated by `Form.create` then it has `this.props.form` pr
 | resetFields | Reset the specified fields' value(to `initialValue`) and status. If you don't specify a parameter, all the fields will be reset. | Function(\[names: string\[]]) |  |
 | setFields | Set value and error state of fields. [Code Sample](https://github.com/react-component/form/blob/3b9959b57ab30b41d8890ff30c79a7e7c383cad3/examples/server-validate.js#L74-L79) | ({<br />&nbsp;&nbsp;\[fieldName\]: {value: any, errors: \[Error\] }<br />}) => void |  |
 | setFieldsValue | Set the value of a field. (Note: please don't use it in `componentWillReceiveProps`, otherwise, it will cause an endless loop, [reason](https://github.com/ant-design/ant-design/issues/2985)) | (<br />&nbsp;&nbsp;{ \[fieldName\]&#x3A; value },<br />&nbsp;&nbsp;callback: Function<br />) => void |  |
-| validateFields | Validate the specified fields and get theirs values and errors. If you don't specify the parameter of fieldNames, you will validate all fields. | (<br />&nbsp;&nbsp;\[fieldNames: string\[]],<br />&nbsp;&nbsp;\[options: object\],<br />&nbsp;&nbsp;callback(errors, values)<br />) => void |  |
+| validateFields | Validate the specified fields and get their values and errors. If you don't specify the parameter of fieldNames, you will validate all fields. | (<br />&nbsp;&nbsp;\[fieldNames: string\[]],<br />&nbsp;&nbsp;\[options: object\],<br />&nbsp;&nbsp;callback(errors, values)<br />) => void |  |
 | validateFieldsAndScroll | This function is similar to `validateFields`, but after validation, if the target field is not in visible area of form, form will be automatically scrolled to the target field area. | same as `validateFields` |  |
 
 ### validateFields/validateFieldsAndScroll