auto merge of #14019 : brson/rust/docs, r=alexcrichton

Just small bits of polish.

diff --combined src/libstd/lib.rs
index 8a783b6f378e2d82a4ffb97d7e97d506f86c7487,ce64bb84ca07f16cdec2aad62177f3dddc64ac9b..dae28777867793ef0e6566f8d9e0a601ce60282b
--- 1/src/libstd/lib.rs
--- 2/src/libstd/lib.rs
+++ b/src/libstd/lib.rs
@@@ -81,7 -81,7 +81,7 @@@
  //! memory types, including [`atomics`](sync/atomics/index.html).
  //!
  //! Common types of I/O, including files, TCP, UPD, pipes, Unix domain sockets,
- //! timers, and process spawning, are defined in the [`io`](io/index.html).
+ //! timers, and process spawning, are defined in the [`io`](io/index.html) module.
  //!
  //! Rust's I/O and concurrency depends on a small runtime interface
  //! that lives, along with its support code, in mod [`rt`](rt/index.html).
@@@ -90,10 -90,11 +90,11 @@@
  //!
  //! ## The Rust prelude and macros
  //!
- //! Finally, the [`prelude`](prelude/index.html) defines a set of
+ //! Finally, the [`prelude`](prelude/index.html) defines a
  //! common set of traits, types, and functions that are made available
  //! to all code by default. [`macros`](macros/index.html) contains
- //! all the standard macros, such as `assert!`, `fail!`, `println!`.
+ //! all the standard macros, such as `assert!`, `fail!`, `println!`,
+ //! and `format!`, also available to all Rust code.
  
  #![crate_id = "std#0.11-pre"]
  #![comment = "The Rust standard library"]
@@@ -278,7 -279,4 +279,7 @@@ mod std 
      pub use ty;
      pub use unstable;
      pub use vec;
 +
 +    // The test runner requires std::slice::Vector, so re-export std::slice just for it.
 +    #[cfg(test)] pub use slice;
  }