clarify vector stub in the container tutorial

This also renames the section, as managed vectors cannot be resized
(since it would invalidate the other references).
doc: Update container tutorial with new names of methods and macros

`deque` -> `ringbuf`, mention `extra::dlist`.

fix reference to vector method `bsearch`. Also convert all output
in example code to use `print!`/`println!`
doc: Fix the tutorial's link to rustpkg docs
auto merge of #9315 : thestinger/rust/doc, r=alexcrichton

This also renames the section, as managed vectors cannot be resized
(since it would invalidate the other references).