Rollup merge of rust-lang#38635 - GuillaumeGomez:atomicptr_docs, r=frewsxcv

Add missing urls for AtomicPtr

r? @frewsxcv

Author: alexcrichton

src/libcore/sync/atomic.rs

@@ -641,11 +641,16 @@ impl<T> AtomicPtr<T> {
 
     /// Loads a value from the pointer.
     ///
-    /// `load` takes an `Ordering` argument which describes the memory ordering of this operation.
+    /// `load` takes an [`Ordering`] argument which describes the memory ordering
+    /// of this operation.
     ///
     /// # Panics
     ///
-    /// Panics if `order` is `Release` or `AcqRel`.
+    /// Panics if `order` is [`Release`] or [`AcqRel`].
+    ///
+    /// [`Ordering`]: enum.Ordering.html
+    /// [`Release`]: enum.Ordering.html#variant.Release
+    /// [`AcqRel`]: enum.Ordering.html#variant.AcqRel
     ///
     /// # Examples
     ///
@@ -665,7 +670,10 @@ impl<T> AtomicPtr<T> {
 
     /// Stores a value into the pointer.
     ///
-    /// `store` takes an `Ordering` argument which describes the memory ordering of this operation.
+    /// `store` takes an [`Ordering`] argument which describes the memory ordering
+    /// of this operation.
+    ///
+    /// [`Ordering`]: enum.Ordering.html
     ///
     /// # Examples
     ///
@@ -693,7 +701,10 @@ impl<T> AtomicPtr<T> {
 
     /// Stores a value into the pointer, returning the old value.
     ///
-    /// `swap` takes an `Ordering` argument which describes the memory ordering of this operation.
+    /// `swap` takes an [`Ordering`] argument which describes the memory ordering
+    /// of this operation.
+    ///
+    /// [`Ordering`]: enum.Ordering.html
     ///
     /// # Examples
     ///
@@ -718,8 +729,10 @@ impl<T> AtomicPtr<T> {
     /// The return value is always the previous value. If it is equal to `current`, then the value
     /// was updated.
     ///
-    /// `compare_and_swap` also takes an `Ordering` argument which describes the memory ordering of
-    /// this operation.
+    /// `compare_and_swap` also takes an [`Ordering`] argument which describes the memory
+    /// ordering of this operation.
+    ///
+    /// [`Ordering`]: enum.Ordering.html
     ///
     /// # Examples
     ///
@@ -748,10 +761,15 @@ impl<T> AtomicPtr<T> {
     /// The return value is a result indicating whether the new value was written and containing
     /// the previous value. On success this value is guaranteed to be equal to `current`.
     ///
-    /// `compare_exchange` takes two `Ordering` arguments to describe the memory ordering of this
-    /// operation. The first describes the required ordering if the operation succeeds while the
-    /// second describes the required ordering when the operation fails. The failure ordering can't
-    /// be `Release` or `AcqRel` and must be equivalent or weaker than the success ordering.
+    /// `compare_exchange` takes two [`Ordering`] arguments to describe the memory
+    /// ordering of this operation. The first describes the required ordering if
+    /// the operation succeeds while the second describes the required ordering when
+    /// the operation fails. The failure ordering can't be [`Release`] or [`AcqRel`]
+    /// and must be equivalent or weaker than the success ordering.
+    ///
+    /// [`Ordering`]: enum.Ordering.html
+    /// [`Release`]: enum.Ordering.html#variant.Release
+    /// [`AcqRel`]: enum.Ordering.html#variant.AcqRel
     ///
     /// # Examples
     ///
@@ -790,16 +808,21 @@ impl<T> AtomicPtr<T> {
 
     /// Stores a value into the pointer if the current value is the same as the `current` value.
     ///
-    /// Unlike `compare_exchange`, this function is allowed to spuriously fail even when the
+    /// Unlike [`compare_exchange`], this function is allowed to spuriously fail even when the
     /// comparison succeeds, which can result in more efficient code on some platforms. The
     /// return value is a result indicating whether the new value was written and containing the
     /// previous value.
     ///
-    /// `compare_exchange_weak` takes two `Ordering` arguments to describe the memory
+    /// `compare_exchange_weak` takes two [`Ordering`] arguments to describe the memory
     /// ordering of this operation. The first describes the required ordering if the operation
     /// succeeds while the second describes the required ordering when the operation fails. The
-    /// failure ordering can't be `Release` or `AcqRel` and must be equivalent or weaker than the
-    /// success ordering.
+    /// failure ordering can't be [`Release`] or [`AcqRel`] and must be equivalent or
+    /// weaker than the success ordering.
+    ///
+    /// [`compare_exchange`]: #method.compare_exchange
+    /// [`Ordering`]: enum.Ordering.html
+    /// [`Release`]: enum.Ordering.html#variant.Release
+    /// [`AcqRel`]: enum.Ordering.html#variant.AcqRel
     ///
     /// # Examples
     ///