Shouldn't use of `extern` in documentation be removed?

The getting started guide of hyber uses `extern crate hyper` https://hyper.rs/guides/client/basic/

I was the opinion that `extern` is no longer necessary and the new/current module system does not require.

and indeed, I confirmed this by removing the `extern` and the code snippet in the example still works...

Question now is,  shouldn't `extern` be removed from the documentation?