** What type of PR is this? **:
bug
What this PR does / why we need it:
修复《工具与命令参考》->>服务端工具，gs_dump章节说明参数描述错误的问题
Which issue this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged):
fixes #I7NBQ5:【测试类型：资料】【测试版本：5.1.0】 问题描述：《工具与命令参考》->服务端工具，gs_dump章节说明参数描述错误
Special notes for your reviewer:
None
Release note:
None