Add tblgen to the index


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28656 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/CommandGuide/index.html b/docs/CommandGuide/index.html
index 74a70dc..22fd85a 100644
--- a/docs/CommandGuide/index.html
+++ b/docs/CommandGuide/index.html
@@ -132,7 +132,21 @@
     represents)</li>
 
 </ul>
+</div>
 
+<!-- *********************************************************************** -->
+<div class="doc_section">
+  <a name="internal">Internal Tools</a>
+</div>
+<!-- *********************************************************************** -->
+
+<div class="doc_text">
+<ul>
+
+<li><a href="html/tblgen.html"><b>tblgen</b></a> -
+    target description reader and generator</li>
+
+</ul>
 </div>
 
 <!-- *********************************************************************** -->