Updated 在线授课接口定义 (markdown)

@@ -243,11 +243,21 @@ Request body：
 Response
 Response
 
 
 ```
 ```
+回调成功：
+
 {
 {
   "data": {},
   "data": {},
   "returnCode": 200,
   "returnCode": 200,
   "returnMsg": "success"
   "returnMsg": "success"
 }
 }
+
+回调失败：
+
+{
+  "data": {},
+  "returnCode": 103,
+  "returnMsg": "进入房间回调失败"
+}
 ```
 ```
 
 
 # 5.客户端断线重连获取课程状态
 # 5.客户端断线重连获取课程状态