Add inline form item explain to demo, #846

components/form/demo/validate.md

@@ -90,6 +90,25 @@ ReactDOM.render(
         <p className="ant-form-explain">请输入正确选项</p>
       </Col>
     </FormItem>
+
+    <FormItem
+      label="Datepicker："
+      labelCol={{span: 5}}>
+      <Col span="6">
+        <FormItem validateStatus="error">
+          <DatePicker />
+          <p className="ant-form-explain">请输入正确选项</p>
+        </FormItem>
+      </Col>
+      <Col span="1">
+        <p className="ant-form-split">-</p>
+      </Col>
+      <Col span="6">
+        <FormItem>
+          <DatePicker />
+        </FormItem>
+      </Col>
+    </FormItem>
   </Form>
 , mountNode);
 ````