Add LockFreeStack documentation to fix broken link in README

Author: pitr-ch

docs/master/Concurrent.html

@@ -248,7 +248,7 @@ <h4>Thread-safe Value Objects, Structures, and Collections</h4>
 A boolean value that can be updated atomically.</li>
 <li>  <a href="http://ruby-concurrency.github.io/concurrent-ruby/master/Concurrent/AtomicFixnum.html">AtomicFixnum</a>
 A numeric value that can be updated atomically.</li>
-<li>  <a href="http://ruby-concurrency.github.io/concurrent-ruby/master/Concurrent/MutexAtomic.html">AtomicReference</a>
+<li>  <a href="http://ruby-concurrency.github.io/concurrent-ruby/master/Concurrent/AtomicReference.html">AtomicReference</a>
 An object reference that may be updated atomically.</li>
 <li>  <a href="http://ruby-concurrency.github.io/concurrent-ruby/master/Concurrent/Exchanger.html">Exchanger</a>
 A synchronization point at which threads can pair and swap elements within pairs. Based on 
@@ -286,7 +286,7 @@ <h4>Thread Synchronization Classes and Algorithms</h4>
 A read/write lock with reentrant and upgrade features.</li>
 <li>  <a href="http://ruby-concurrency.github.io/concurrent-ruby/master/Concurrent/Semaphore.html">Semaphore</a>
 A counting-based locking mechanism that uses permits.</li>
-<li>  <a href="http://ruby-concurrency.github.io/concurrent-ruby/master/Concurrent/Atomic/AtomicMarkableReference.html">AtomicMarkableReference</a></li>
+<li>  <a href="http://ruby-concurrency.github.io/concurrent-ruby/master/Concurrent/AtomicMarkableReference.html">AtomicMarkableReference</a></li>
 </ul>
 
 <h4>Deprecated</h4>
@@ -470,7 +470,7 @@ <h2>License and Copyright</h2>
 
 
 
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 </p>