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/tutorial/OCamlLangImpl7.html b/docs/tutorial/OCamlLangImpl7.html
index 42d8141..aebc81c 100644
--- a/docs/tutorial/OCamlLangImpl7.html
+++ b/docs/tutorial/OCamlLangImpl7.html
@@ -13,7 +13,7 @@
 
 <body>
 
-<div class="doc_title">Kaleidoscope: Extending the Language: Mutable Variables</div>
+<h1>Kaleidoscope: Extending the Language: Mutable Variables</h1>
 
 <ul>
 <li><a href="index.html">Up to Tutorial Index</a></li>
@@ -42,7 +42,7 @@
 </div>
 
 <!-- *********************************************************************** -->
-<div class="doc_section"><a name="intro">Chapter 7 Introduction</a></div>
+<h2><a name="intro">Chapter 7 Introduction</a></h2>
 <!-- *********************************************************************** -->
 
 <div class="doc_text">
@@ -70,7 +70,7 @@
 </div>
 
 <!-- *********************************************************************** -->
-<div class="doc_section"><a name="why">Why is this a hard problem?</a></div>
+<h2><a name="why">Why is this a hard problem?</a></h2>
 <!-- *********************************************************************** -->
 
 <div class="doc_text">
@@ -144,7 +144,7 @@
 </div>
 
 <!-- *********************************************************************** -->
-<div class="doc_section"><a name="memory">Memory in LLVM</a></div>
+<h2><a name="memory">Memory in LLVM</a></h2>
 <!-- *********************************************************************** -->
 
 <div class="doc_text">
@@ -325,8 +325,7 @@
 </div>
 
 <!-- *********************************************************************** -->
-<div class="doc_section"><a name="kalvars">Mutable Variables in
-Kaleidoscope</a></div>
+<h2><a name="kalvars">Mutable Variables in Kaleidoscope</a></h2>
 <!-- *********************************************************************** -->
 
 <div class="doc_text">
@@ -382,8 +381,7 @@
 </div>
 
 <!-- *********************************************************************** -->
-<div class="doc_section"><a name="adjustments">Adjusting Existing Variables for
-Mutation</a></div>
+<h2><a name="adjustments">Adjusting Existing Variables for Mutation</a></h2>
 <!-- *********************************************************************** -->
 
 <div class="doc_text">
@@ -672,7 +670,7 @@
 </div>
 
 <!-- *********************************************************************** -->
-<div class="doc_section"><a name="assignment">New Assignment Operator</a></div>
+<h2><a name="assignment">New Assignment Operator</a></h2>
 <!-- *********************************************************************** -->
 
 <div class="doc_text">
@@ -773,8 +771,7 @@
 </div>
 
 <!-- *********************************************************************** -->
-<div class="doc_section"><a name="localvars">User-defined Local
-Variables</a></div>
+<h2><a name="localvars">User-defined Local Variables</a></h2>
 <!-- *********************************************************************** -->
 
 <div class="doc_text">
@@ -956,7 +953,7 @@
 </div>
 
 <!-- *********************************************************************** -->
-<div class="doc_section"><a name="code">Full Code Listing</a></div>
+<h2><a name="code">Full Code Listing</a></h2>
 <!-- *********************************************************************** -->
 
 <div class="doc_text">