MINOR: Fix plugin path in quickstart.html (#12252)
MINOR: Fix plugin path in quickstart.html (#12252)

Reviewers: Luke Chen <a747209bc9e65a9d7dd7589245c91b7bed721b13@gmail.com>
lindong28/kafka,apache/kafka,apache/kafka,guozhangwang/kafka,apache/kafka,lindong28/kafka,guozhangwang/kafka,lindong28/kafka,lindong28/kafka,guozhangwang/kafka,guozhangwang/kafka,apache/kafka