Thanks for letting me know. The example shown is incorrect as you can't reply to it. Because to reply you need to have a channel id in event object and slack doesn't send a channel id for file_shared event (https://api.slack.com/events/file_shared).
These kinds of things never work, people rarely pick up non-obvious pronunciations or abbreviations (look at nginx, SQL, or npm). So don't get too attached to the idea.
Am very happy to see JBot listed on slack.com (https://api.slack.com/community)