@Override
    public String toString() {
        return MoreObjects.toStringHelper(this)
                          .add("name", name)
                          .add("fields", fields)
                          .add("descriptionInfo", descriptionInfo)
                          .toString();
    }
Returns a new {@link ExceptionInfo} with the specified {@link DescriptionInfo}.
Returns {@code this} if this {@link ExceptionInfo} has the same {@link DescriptionInfo}.
core/src/main/java/com/linecorp/armeria/server/docs/ExceptionInfo.java