Apply clippy's doc_markdown improvements to libcollections

Since my last PR led to linker failure, I'm now taking much smaller steps.
This only fixes some doc_markdown warnings; as they are in comments only,
we shouldn't get any problems building.

src/libcollections/btree/map.rs

@@ -262,7 +262,7 @@ impl<K, Q: ?Sized> super::Recover<Q> for BTreeMap<K, ()>
     }
 }
 
-/// An iterator over a BTreeMap's entries.
+/// An iterator over a `BTreeMap`'s entries.
 #[stable(feature = "rust1", since = "1.0.0")]
 pub struct Iter<'a, K: 'a, V: 'a> {
     range: Range<'a, K, V>,
@@ -276,7 +276,7 @@ impl<'a, K: 'a + fmt::Debug, V: 'a + fmt::Debug> fmt::Debug for Iter<'a, K, V> {
     }
 }
 
-/// A mutable iterator over a BTreeMap's entries.
+/// A mutable iterator over a `BTreeMap`'s entries.
 #[stable(feature = "rust1", since = "1.0.0")]
 #[derive(Debug)]
 pub struct IterMut<'a, K: 'a, V: 'a> {
@@ -284,7 +284,7 @@ pub struct IterMut<'a, K: 'a, V: 'a> {
     length: usize,
 }
 
-/// An owning iterator over a BTreeMap's entries.
+/// An owning iterator over a `BTreeMap`'s entries.
 #[stable(feature = "rust1", since = "1.0.0")]
 pub struct IntoIter<K, V> {
     front: Handle<NodeRef<marker::Owned, K, V, marker::Leaf>, marker::Edge>,
@@ -303,7 +303,7 @@ impl<K: fmt::Debug, V: fmt::Debug> fmt::Debug for IntoIter<K, V> {
     }
 }
 
-/// An iterator over a BTreeMap's keys.
+/// An iterator over a `BTreeMap`'s keys.
 #[stable(feature = "rust1", since = "1.0.0")]
 pub struct Keys<'a, K: 'a, V: 'a> {
     inner: Iter<'a, K, V>,
@@ -316,7 +316,7 @@ impl<'a, K: 'a + fmt::Debug, V: 'a + fmt::Debug> fmt::Debug for Keys<'a, K, V> {
     }
 }
 
-/// An iterator over a BTreeMap's values.
+/// An iterator over a `BTreeMap`'s values.
 #[stable(feature = "rust1", since = "1.0.0")]
 pub struct Values<'a, K: 'a, V: 'a> {
     inner: Iter<'a, K, V>,
@@ -329,14 +329,14 @@ impl<'a, K: 'a + fmt::Debug, V: 'a + fmt::Debug> fmt::Debug for Values<'a, K, V>
     }
 }
 
-/// A mutable iterator over a BTreeMap's values.
+/// A mutable iterator over a `BTreeMap`'s values.
 #[stable(feature = "map_values_mut", since = "1.10.0")]
 #[derive(Debug)]
 pub struct ValuesMut<'a, K: 'a, V: 'a> {
     inner: IterMut<'a, K, V>,
 }
 
-/// An iterator over a sub-range of BTreeMap's entries.
+/// An iterator over a sub-range of `BTreeMap`'s entries.
 #[stable(feature = "btree_range", since = "1.17.0")]
 pub struct Range<'a, K: 'a, V: 'a> {
     front: Handle<NodeRef<marker::Immut<'a>, K, V, marker::Leaf>, marker::Edge>,
@@ -350,7 +350,7 @@ impl<'a, K: 'a + fmt::Debug, V: 'a + fmt::Debug> fmt::Debug for Range<'a, K, V>
     }
 }
 
-/// A mutable iterator over a sub-range of BTreeMap's entries.
+/// A mutable iterator over a sub-range of `BTreeMap`'s entries.
 #[stable(feature = "btree_range", since = "1.17.0")]
 pub struct RangeMut<'a, K: 'a, V: 'a> {
     front: Handle<NodeRef<marker::Mut<'a>, K, V, marker::Leaf>, marker::Edge>,
@@ -378,12 +378,12 @@ impl<'a, K: 'a + fmt::Debug, V: 'a + fmt::Debug> fmt::Debug for RangeMut<'a, K,
 /// [`entry`]: struct.BTreeMap.html#method.entry
 #[stable(feature = "rust1", since = "1.0.0")]
 pub enum Entry<'a, K: 'a, V: 'a> {
-    /// A vacant Entry
+    /// A vacant `Entry`
     #[stable(feature = "rust1", since = "1.0.0")]
     Vacant(#[stable(feature = "rust1", since = "1.0.0")]
            VacantEntry<'a, K, V>),
 
-    /// An occupied Entry
+    /// An occupied `Entry`
     #[stable(feature = "rust1", since = "1.0.0")]
     Occupied(#[stable(feature = "rust1", since = "1.0.0")]
              OccupiedEntry<'a, K, V>),
@@ -403,7 +403,7 @@ impl<'a, K: 'a + Debug + Ord, V: 'a + Debug> Debug for Entry<'a, K, V> {
     }
 }
 
-/// A vacant Entry. It is part of the [`Entry`] enum.
+/// A vacant `Entry`. It is part of the [`Entry`] enum.
 ///
 /// [`Entry`]: enum.Entry.html
 #[stable(feature = "rust1", since = "1.0.0")]
@@ -425,7 +425,7 @@ impl<'a, K: 'a + Debug + Ord, V: 'a> Debug for VacantEntry<'a, K, V> {
     }
 }
 
-/// An occupied Entry. It is part of the [`Entry`] enum.
+/// An occupied `Entry`. It is part of the [`Entry`] enum.
 ///
 /// [`Entry`]: enum.Entry.html
 #[stable(feature = "rust1", since = "1.0.0")]

src/libcollections/enum_set.rs

@@ -215,7 +215,7 @@ impl<E: CLike> BitXor for EnumSet<E> {
     }
 }
 
-/// An iterator over an EnumSet
+/// An iterator over an `EnumSet`
 pub struct Iter<E> {
     index: usize,
     bits: usize,

src/libcollections/lib.rs

@@ -10,8 +10,8 @@
 
 //! Collection types.
 //!
-//! See [std::collections](../std/collections/index.html) for a detailed discussion of
-//! collections in Rust.
+//! See [`std::collections`](../std/collections/index.html) for a detailed
+//! discussion of collections in Rust.
 
 #![crate_name = "collections"]
 #![crate_type = "rlib"]

src/libcollections/range.rs

@@ -17,7 +17,7 @@
 use core::ops::{RangeFull, Range, RangeTo, RangeFrom, RangeInclusive, RangeToInclusive};
 use Bound::{self, Excluded, Included, Unbounded};
 
-/// **RangeArgument** is implemented by Rust's built-in range types, produced
+/// `RangeArgument` is implemented by Rust's built-in range types, produced
 /// by range syntax like `..`, `a..`, `..b` or `c..d`.
 pub trait RangeArgument<T: ?Sized> {
     /// Start index bound.

src/libcollections/vec_deque.rs

@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-//! VecDeque is a double-ended queue, which is implemented with the help of a
+//! `VecDeque` is a double-ended queue, which is implemented with the help of a
 //! growing ring buffer.
 //!
 //! This queue has `O(1)` amortized inserts and removals from both ends of the
@@ -1847,7 +1847,7 @@ fn wrap_index(index: usize, size: usize) -> usize {
     index & (size - 1)
 }
 
-/// Returns the two slices that cover the VecDeque's valid range
+/// Returns the two slices that cover the `VecDeque`'s valid range
 trait RingSlices: Sized {
     fn slice(self, from: usize, to: usize) -> Self;
     fn split_at(self, i: usize) -> (Self, Self);
@@ -2047,7 +2047,7 @@ impl<'a, T> ExactSizeIterator for IterMut<'a, T> {
 #[unstable(feature = "fused", issue = "35602")]
 impl<'a, T> FusedIterator for IterMut<'a, T> {}
 
-/// A by-value VecDeque iterator
+/// A by-value `VecDeque` iterator
 #[derive(Clone)]
 #[stable(feature = "rust1", since = "1.0.0")]
 pub struct IntoIter<T> {
@@ -2097,7 +2097,7 @@ impl<T> ExactSizeIterator for IntoIter<T> {
 #[unstable(feature = "fused", issue = "35602")]
 impl<T> FusedIterator for IntoIter<T> {}
 
-/// A draining VecDeque iterator
+/// A draining `VecDeque` iterator
 #[stable(feature = "drain", since = "1.6.0")]
 pub struct Drain<'a, T: 'a> {
     after_tail: usize,