ja/Ryubook.pdf: 7e20f9a rest_firewall: add the descriptions for priority and rule_id
ja/html: 7e20f9a rest_firewall: add the descriptions for priority and rule_id
ja/Ryubook.epub: 7e20f9a rest_firewall: add the descriptions for priority and rule_id
ja/Ryubook.mobi: 7e20f9a rest_firewall: add the descriptions for priority and rule_id