Chat tries to GET /{{{url}}}

[mariusa]

When running chat.html, it sends a GET request, which gives

ERROR `/{{{url}}}' not found.

It seems the cause is

{{#if image}}
                            <img src="{{{url}}}" alt="{{{url}}}" /> {{else}}
                            <a href="{{{url}}}" title="{{{url}}}">{{{url}}}</a>
                            {{/if}}

Would you please document how to use that, and change the name to something more clear? eg. {{{file_icon_url}}}

Thanks