adopters: fix a broken link (#764)
adopters: fix a broken link (#764)

* adopters: fix a broken link

* Update adopters.md

Co-Authored-By: CaitinChen <993aa8c4860e3c7690803b38a86b03e49bbad7db@users.noreply.github.com>

pingcap/docs,pingcap/docs,pingcap/docs