auto merge of #14547 : reem/rust/remove-owned-vec-docs, r=alexcrichton

The last example in the containers and iterators guide had a superfluous owned vector in it. Everything works fine without it, so I removed it to avoid confusion.

Author: bors

src/doc/guide-container.md

@@ -396,7 +396,7 @@ underlying iterators are.
 
 ~~~
 let xs = [1, 2, 3, 4, 5];
-let ys = ~[7, 9, 11];
+let ys = [7, 9, 11];
 let mut it = xs.iter().chain(ys.iter());
 println!("{}", it.idx(0)); // prints `Some(1)`
 println!("{}", it.idx(5)); // prints `Some(7)`