private String getProduceConsume(final Collection<String> list) {
        String res = StringUtils.EMPTY;
        if (Objects.nonNull(list)) {
            Optional<String> first = list.stream().findFirst();
            if (first.isPresent()) {
                res = first.get();
            }
        }
        return StringUtils.isNotEmpty(res) ? res : "*/*";
    }
add docInfo.

@param instance    instance
@param docInfoJson docInfoJson
@param callback    callback
shenyu-admin/src/main/java/org/apache/shenyu/admin/service/manager/impl/DocManagerImpl.java