update doc api

@@ -116,3 +116,26 @@ public static class Request {
 }
 ```
 
+
+
+##### 5. 后台页面赠送学生 精华小学期课程接口
+
+- URL: {{localhost}}/boxfish-online-card/order/textbook/manage/submitOrderXxq
+- Method: POST
+- RequestBody:
+
+```java
+public static class Request {
+    private Long userId;            // 收货人盒子鱼ID
+    private String grade;           // 赠送小学期的年级
+    private Long sourceInvitationCode;  // 该收货人的邀请人
+
+    private String orderName;
+    private String orderMobile;
+
+    private String orderProvince;
+    private String orderCity;
+    private String orderCounty;
+    private String orderAddressDetail;
+}
+```