Update tiflash-configuration.md (#4198)
Update tiflash-configuration.md (#4198)

* Update tiflash-configuration.md

* Update tiflash/tiflash-configuration.md

Co-authored-by: Tong Zhigao <0ba8d25a9e07503569207e68f95dba98e9a466bf@163.com>

Co-authored-by: Tong Zhigao <0ba8d25a9e07503569207e68f95dba98e9a466bf@163.com>
pingcap/docs,pingcap/docs,pingcap/docs