Rewrite references section

[steveklabnik]

rust-lang/rust#27911

[nyurik]

This section is highly confusing: what is this compiler error is about? https://doc.rust-lang.org/nomicon/references.html

---

Of course, we should probably define what aliased means.

error[E0425]: cannot find value `aliased` in this scope
 --> <rust.rs>:2:20
  |
2 |     println!("{}", aliased);
  |                    ^^^^^^^ not found in this scope

error: aborting due to previous error

Unfortunately, Rust hasn't actually defined its aliasing model. 🙀

[ehuss]

I think it is supposed to be a joke. IOW, "aliasing is not found" because it is currently not defined.