修改负载均衡章节错误

[Toms1999]

下面的是conf.d找不到文件

[luzhijing]

Thanks for your contribution. Please also change the 2.0/dev version docs if the typo exist.

[KassieZ]

Thank you for your contribution. However, this pull request contains comments and unresolved conflicts. As a result, it will be closed. If you still wish to submit your changes, please create a new pull request.