document iteration order for vec_deque::IntoIter

src/libcollections/vec_deque.rs

@@ -556,7 +556,7 @@ impl<T> VecDeque<T> {
         }
     }
 
-    /// Consumes the list into an iterator yielding elements by value.
+    /// Consumes the list into a front-to-back iterator yielding elements by value.
     #[stable(feature = "rust1", since = "1.0.0")]
     pub fn into_iter(self) -> IntoIter<T> {
         IntoIter {