extra: Mention extra::container::Deque trait in doc for RingBuf and DList

Author: blake2-ppc

src/libextra/dlist.rs

@@ -11,6 +11,9 @@
 //! A doubly-linked list with owned nodes.
 //!
 //! The DList allows pushing and popping elements at either end.
+//!
+//! DList implements the trait Deque. It should be imported with `use
+//! extra::container::Deque`.
 
 
 // DList is constructed like a singly-linked list over the field `next`.
@@ -27,7 +30,7 @@ use std::iterator::FromIterator;
 
 use container::Deque;
 
-/// A doubly-linked list
+/// A doubly-linked list.
 pub struct DList<T> {
     priv length: uint,
     priv list_head: Link<T>,

src/libextra/ringbuf.rs

@@ -9,6 +9,9 @@
 // except according to those terms.
 
 //! A double-ended queue implemented as a circular buffer
+//!
+//! RingBuf implements the trait Deque. It should be imported with `use
+//! extra::container::Deque`.
 
 use std::num;
 use std::util;
@@ -21,7 +24,7 @@ use container::Deque;
 static INITIAL_CAPACITY: uint = 8u; // 2^3
 static MINIMUM_CAPACITY: uint = 2u;
 
-#[allow(missing_doc)]
+/// RingBuf is a circular buffer that implements Deque.
 #[deriving(Clone)]
 pub struct RingBuf<T> {
     priv nelts: uint,