Fix validation error.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@68432 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/WritingAnLLVMBackend.html b/docs/WritingAnLLVMBackend.html
index a1dc34c..a7512c2 100644
--- a/docs/WritingAnLLVMBackend.html
+++ b/docs/WritingAnLLVMBackend.html
@@ -2259,6 +2259,8 @@
 </pre>
 </div>
 
+</div>
+
 <!-- *********************************************************************** -->
 <div class="doc_section">
   <a name="jitSupport">JIT Support</a>