Wrong name used in code example in Rust reference

[dsyang]

In the Use Declarations section of the rust reference manual (http://doc.rust-lang.org/reference.html#use-declarations), the third code example has the following line
// use core::iter; // bad: native is not at the crate root
I think the comment should read:
// bad: core is not at the crate root or something else. It shouldn't reference native because native isn't used anywhere in the code example.

[dsyang]

I'd be willing to submit a PR if someone could check to see if my reasoning is correct.

[steveklabnik]

When in doubt, the reference is probably wrong 😉 I have it scheduled to update during the beta period, and so I believe you are correct. A PR would be great, thanks!=

[alexcrichton]

Fixed in #21819