KAFKA-12408: Document omitted ReplicaManager metrics (#10258)
KAFKA-12408: Document omitted ReplicaManager metrics (#10258)


Reviewers: Tom Bentley <9abc7ce151cd8e60f5b89ee8fb9d401f809fdae0@redhat.com>
guozhangwang/kafka,TiVo/kafka,lindong28/kafka,lindong28/kafka,TiVo/kafka,lindong28/kafka,apache/kafka,TiVo/kafka,apache/kafka,apache/kafka,TiVo/kafka,apache/kafka,guozhangwang/kafka,lindong28/kafka,guozhangwang/kafka,guozhangwang/kafka