增加调试信息页面 (oceanbase#284)

### What problem were solved in this pull request?

Problem:
有训练营自助调试的页面，但是主页上没有展示

### What is changed and how it works?
在summary.md中增加链接

docs/src/SUMMARY.md

@@ -24,6 +24,7 @@
 
 - [OceanBase 数据库大赛](./game/introduction.md)
   - [提交测试需要满足的输出要求](./game/miniob-output-convention.md)
+  - [自助输出调试信息](./game/debug-output.md)
   - [2021届大赛题目介绍](./game/miniob_topics.md)
   - [使用GitHub参加训练营](./game/github-introduction.md)
   - [使用Gitee参加训练营](./game/gitee-instructions.md)