docs: Use <Hn> as Heading elements instead of <DIV class="doc_foo">.

H1 ... doc_title
H2 ... doc_section
H3 ... doc_subsection
H4 ... doc_subsubsection

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129736 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/CommandGuide/index.html b/docs/CommandGuide/index.html
index 4ab1b51..98e97ee 100644
--- a/docs/CommandGuide/index.html
+++ b/docs/CommandGuide/index.html
@@ -7,9 +7,9 @@
 </head>
 <body>
 
-<div class="doc_title">
+<h1>
   LLVM Command Guide
-</div>
+</h1>
 
 <div class="doc_text">
 
@@ -23,9 +23,9 @@
 </div>
 
 <!-- *********************************************************************** -->
-<div class="doc_section">
+<h2>
   <a name="basic">Basic Commands</a>
-</div>
+</h2>
 <!-- *********************************************************************** -->
 
 <div class="doc_text">
@@ -80,9 +80,9 @@
 </div>
 
 <!-- *********************************************************************** -->
-<div class="doc_section">
+<h2>
   <a name="frontend">C and C++ Front-end Commands</a>
-</div>
+</h2>
 <!-- *********************************************************************** -->
 
 <div class="doc_text">
@@ -99,9 +99,9 @@
 </div>
 
 <!-- *********************************************************************** -->
-<div class="doc_section">
+<h2>
   <a name="debug">Debugging Tools</a>
-</div>
+</h2>
 <!-- *********************************************************************** -->
 
 
@@ -123,9 +123,9 @@
 </div>
 
 <!-- *********************************************************************** -->
-<div class="doc_section">
+<h2>
   <a name="internal">Internal Tools</a>
-</div>
+</h2>
 <!-- *********************************************************************** -->
 
 <div class="doc_text">