[syt-zg]

问题

仓库内站内相对链接统一带 .md 扩展名，共 1358 处。但有 3 处漏写了扩展名，在 GitHub 网页上点击会 404，而目标文件实际是存在的。

文件	行	现状	改为
docs/cs-basics/network/other-network-questions.md	198	./https-rsa-vs-ecdhe	./https-rsa-vs-ecdhe.md
docs/distributed-system/distributed-id.md	543	./distributed-id-design	./distributed-id-design.md
docs/high-quality-technical-articles/programmer/efficient-book-publishing-and-practice-guide.md	53	./how-do-programmers-publish-a-technical-book	./how-do-programmers-publish-a-technical-book.md

验证

三处目标文件均已确认存在，补全扩展名后链接可正常跳转。以第一处为例：

• https://github.com/Snailclimb/JavaGuide/blob/main/docs/cs-basics/network/https-rsa-vs-ecdhe → 404
• https://github.com/Snailclimb/JavaGuide/blob/main/docs/cs-basics/network/https-rsa-vs-ecdhe.md → 200

另外两处行为一致（distributed-id-design、how-do-programmers-publish-a-technical-book）。

改动范围

仅补全链接扩展名，未改动任何正文内容，3 个文件共 3 行。修改后的写法与仓库其余 1358 处保持一致。