MINOR: Fix small typo in main README (#7779)
MINOR: Fix small typo in main README (#7779)

Fixed a small typo in the main README file ("They are also are printed" --> "They are also printed").

Reviewers: Manikumar Reddy <5c5b03b4d6e1a3a45d39ad15b70eab568fe0a48b@gmail.com>
sslavic/kafka,guozhangwang/kafka,guozhangwang/kafka,Chasego/kafka,TiVo/kafka,TiVo/kafka,Chasego/kafka,sslavic/kafka,Chasego/kafka,TiVo/kafka,guozhangwang/kafka,sslavic/kafka,TiVo/kafka,apache/kafka,Chasego/kafka,lindong28/kafka,apache/kafka,apache/kafka,lindong28/kafka,lindong28/kafka,apache/kafka,sslavic/kafka,lindong28/kafka,guozhangwang/kafka