add api-字段描述

@@ -171,16 +171,20 @@ private Boolean flagClassClosed;    // 是否已结课：true查询已结束的
 
 ```json
 {
+  // 默认中教信息
   "teacherId": 100,
   "teacherInfo": {
     "userId": 100,
     "realName": "Jodi"
   },
+  // 默认外教信息
   "teacherIdForeign": 100,
   "teacherInfoForeign": {
     "userId": 100,
     "realName": "Jodi"
   },
+  
+  // 上课课表信息
   "list": [
     {
       "classSmallId": 18,
@@ -199,6 +203,8 @@ private Boolean flagClassClosed;    // 是否已结课：true查询已结束的
       "teacherName": "刘老师"
     }
   ],
+  
+  // 学习课表信息
   "learnCourseDetailList": [
     {
       "id": 8,