Update spec
Update spec

We must use `type` instead of `@type` to initialize model.
Because we cannot define `@type` expected.

Signed-off-by: Kenji Okimoto <7a4b90a0a1e6fc688adec907898b6822ce215e6c@clear-code.com>

fluent/fluentd-ui,fluent/fluentd-ui,fluent/fluentd-ui