Fix invalid ItemView example in docs

Looks like this was changed acknowledge the `underscore@1.7` template changes, however it nolonger passes the `variable: 'args'`

(90% sure) this should work in any version of underscore >= 1 
Wait so underscore both broke compatibility by removing `data` but didn't break compatibility with the `settings` argument (as long as a user changes `data` to `null`)?