Doc: Deadlink for brpc.baidu.com:8765

**Is your feature request related to a problem? (你需要的功能是否与某个问题有关?)**

No

**Describe the solution you'd like (描述你期望的解决方法)**

Solve the deadlink?

**Describe alternatives you've considered (描述你想到的折衷方案)**

Use https://brpc.apache.org/ ?

**Additional context/screenshots (更多上下文/截图)**

https://github.com/search?q=repo%3Aapache%2Fbrpc+brpc.baidu.com&type=code

Start with the linked GitHub code search for occurrences of brpc.baidu.com and inspect the surrounding documentation. Verify whether https://brpc.apache.org/ is the correct replacement, update the dead link where appropriate, and confirm no affected documentation links remain.

Written by the indexing model from the issue text.