v3 doc need more example

[DoubleSpout]

v3 doc need more example, such as api return schema like:

  events = { {
      kv = {
        create_revision = "42",
        key = "/aaa/bbb",
        mod_revision = "43",
        value = "abc",
        version = "2"
      }
    }, {
      kv = {
        key = "/xxx/yyy",
        mod_revision = "44"
      },
      type = "DELETE"
    } },
  header = {
    cluster_id = "14841639068965178418",
    member_id = "10276657743932975437",
    raft_term = "2",
    revision = "44"
  }
}

[membphis]

PR welcome