Fix verb tense agreement.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139480 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/Atomics.html b/docs/Atomics.html
index d4a3795..9d9bdac 100644
--- a/docs/Atomics.html
+++ b/docs/Atomics.html
@@ -308,7 +308,7 @@
       which would make those optimizations useful.</dd>
   <dt>Notes for code generation</dt>
   <dd>Code generation is essentially the same as that for unordered for loads
-     and stores.  No fences is required.  <code>cmpxchg</code> and 
+     and stores.  No fences are required.  <code>cmpxchg</code> and 
      <code>atomicrmw</code> are required to appear as a single operation.</dd>
 </dl>