Steps to reproduce:

1. Go to https://www.zabbix.com/documentation/current/en/manual/config/items/itemtypes/zabbix_agent/zabbix_agent2#mysql.custom.query
2. Find the link for "MySQL Plugin readme"
3. Takes you to https://git.zabbix.com/projects/AP/repos/mysql/browse/README.md?at=refs%2Fheads%2Frelease%2F7.4
4. Should be taking you to https://git.zabbix.com/projects/ZBX/repos/zabbix/browse/src/go/plugins/mysql/README.md

Result:

Inaccessible documentation page at https://git.zabbix.com/projects/AP/repos/mysql/browse/README.md?at=refs%2Fheads%2Frelease%2F7.4

Expected:

Accessible documentation at https://git.zabbix.com/projects/ZBX/repos/zabbix/browse/src/go/plugins/mysql/README.md