update doc api

@@ -178,4 +178,18 @@ public static class ScheduleDetail {
         }
         }
     ]
     ]
 }
 }
+```
+
+
+
+##### 9. 检查课表群组是否存在
+
+- URL: {{localhost}}/boxfish-online-card/classOnline/manage/checkScheduleGroup
+- Method: POST
+- RequestBody:
+
+```json5
+{
+   "scheduleClassId": "CIDLUA-BE408AE7C39443C9AE8269B0E97B0339"
+}
 ```
 ```