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/LangImpl2.html b/docs/tutorial/LangImpl2.html
index ac4f1ee..bfe8d3f 100644
--- a/docs/tutorial/LangImpl2.html
+++ b/docs/tutorial/LangImpl2.html
@@ -11,7 +11,7 @@
 
 <body>
 
-<div class="doc_title">Kaleidoscope: Implementing a Parser and AST</div>
+<h1>Kaleidoscope: Implementing a Parser and AST</h1>
 
 <ul>
 <li><a href="index.html">Up to Tutorial Index</a></li>
@@ -36,7 +36,7 @@
 </div>
 
 <!-- *********************************************************************** -->
-<div class="doc_section"><a name="intro">Chapter 2 Introduction</a></div>
+<h2><a name="intro">Chapter 2 Introduction</a></h2>
 <!-- *********************************************************************** -->
 
 <div class="doc_text">
@@ -61,7 +61,7 @@
 </div>
 
 <!-- *********************************************************************** -->
-<div class="doc_section"><a name="ast">The Abstract Syntax Tree (AST)</a></div>
+<h2><a name="ast">The Abstract Syntax Tree (AST)</a></h2>
 <!-- *********************************************************************** -->
 
 <div class="doc_text">
@@ -178,7 +178,7 @@
 </div>
 
 <!-- *********************************************************************** -->
-<div class="doc_section"><a name="parserbasics">Parser Basics</a></div>
+<h2><a name="parserbasics">Parser Basics</a></h2>
 <!-- *********************************************************************** -->
 
 <div class="doc_text">
@@ -239,8 +239,7 @@
 </div>
 
 <!-- *********************************************************************** -->
-<div class="doc_section"><a name="parserprimexprs">Basic Expression
- Parsing</a></div>
+<h2><a name="parserprimexprs">Basic Expression Parsing</a></h2>
 <!-- *********************************************************************** -->
 
 <div class="doc_text">
@@ -394,8 +393,7 @@
 </div>
 
 <!-- *********************************************************************** -->
-<div class="doc_section"><a name="parserbinops">Binary Expression
- Parsing</a></div>
+<h2><a name="parserbinops">Binary Expression Parsing</a></h2>
 <!-- *********************************************************************** -->
 
 <div class="doc_text">
@@ -617,7 +615,7 @@
 </div>
 
 <!-- *********************************************************************** -->
-<div class="doc_section"><a name="parsertop">Parsing the Rest</a></div>
+<h2><a name="parsertop">Parsing the Rest</a></h2>
 <!-- *********************************************************************** -->
 
 <div class="doc_text">
@@ -714,7 +712,7 @@
 </div>
 
 <!-- *********************************************************************** -->
-<div class="doc_section"><a name="driver">The Driver</a></div>
+<h2><a name="driver">The Driver</a></h2>
 <!-- *********************************************************************** -->
 
 <div class="doc_text">
@@ -753,7 +751,7 @@
 </div>
 
 <!-- *********************************************************************** -->
-<div class="doc_section"><a name="conclusions">Conclusions</a></div>
+<h2><a name="conclusions">Conclusions</a></h2>
 <!-- *********************************************************************** -->
 
 <div class="doc_text">
@@ -790,7 +788,7 @@
 </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">