Explain why the _(3).times(...) example in the documentation is correct

New users expect the example to follow the syntax, i.e.

```
_.times(3, function(n){ genie.grantWishNumber(n); });
```

In fact, someone already posted issue #381 about this. I was also surprised by the syntax, and had to go test.

Would be nice to clearly explain why the example is correct, or just use the expected syntax and explain chaining later.
