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/CMake.html b/docs/CMake.html
index 73e6f44..8ea4377 100644
--- a/docs/CMake.html
+++ b/docs/CMake.html
@@ -6,9 +6,9 @@
   <link rel="stylesheet" href="llvm.css" type="text/css">
 </head>
 
-<div class="doc_title">
+<h1>
   Building LLVM with CMake
-</div>
+</h1>
 
 <ul>
   <li><a href="#intro">Introduction</a></li>
@@ -36,9 +36,9 @@
 </div>
 
 <!-- *********************************************************************** -->
-<div class="doc_section">
+<h2>
 <a name="intro">Introduction</a>
-</div>
+</h2>
 <!-- *********************************************************************** -->
 
 <div class="doc_text">
@@ -59,9 +59,9 @@
 </div>
 
 <!-- *********************************************************************** -->
-<div class="doc_section">
+<h2>
 <a name="quickstart">Quick start</a>
-</div>
+</h2>
 <!-- *********************************************************************** -->
 
 <div class="doc_text">
@@ -112,9 +112,9 @@
 </div>
 
 <!-- *********************************************************************** -->
-<div class="doc_section">
+<h2>
   <a name="usage">Basic CMake usage</a>
-</div>
+</h2>
 <!-- *********************************************************************** -->
 
 <div class="doc_text">
@@ -160,9 +160,9 @@
 </div>
 
 <!-- *********************************************************************** -->
-<div class="doc_section">
+<h2>
   <a name="options">Options and variables</a>
-</div>
+</h2>
 <!-- *********************************************************************** -->
 
 <div class="doc_text">
@@ -197,9 +197,9 @@
 </div>
 
 <!-- ======================================================================= -->
-<div class="doc_subsection">
+<h3>
   <a name="freccmake">Frequently-used CMake variables</a>
-</div>
+</h3>
 
 <div class="doc_text">
 
@@ -240,9 +240,9 @@
 </div>
 
 <!-- ======================================================================= -->
-<div class="doc_subsection">
+<h3>
   <a name="llvmvars">LLVM-specific variables</a>
-</div>
+</h3>
 
 <div class="doc_text">
 
@@ -358,9 +358,9 @@
 </div>
 
 <!-- *********************************************************************** -->
-<div class="doc_section">
+<h2>
   <a name="testing">Executing the test suite</a>
-</div>
+</h2>
 <!-- *********************************************************************** -->
 
 <div class="doc_text">
@@ -378,9 +378,9 @@
 </div>
 
 <!-- *********************************************************************** -->
-<div class="doc_section">
+<h2>
   <a name="cross">Cross compiling</a>
-</div>
+</h2>
 <!-- *********************************************************************** -->
 
 <div class="doc_text">
@@ -399,9 +399,9 @@
 </div>
 
 <!-- *********************************************************************** -->
-<div class="doc_section">
+<h2>
   <a name="embedding">Embedding LLVM in your project</a>
-</div>
+</h2>
 <!-- *********************************************************************** -->
 
 <div class="doc_text">
@@ -462,9 +462,9 @@
 </div>
 
 <!-- ======================================================================= -->
-<div class="doc_subsection">
+<h3>
   <a name="passdev">Developing LLVM pass out of source</a>
-</div>
+</h3>
 
 <div class="doc_text">
 
@@ -519,9 +519,9 @@
 <!-- *********************************************************************** -->
 
 <!-- *********************************************************************** -->
-<div class="doc_section">
+<h2>
   <a name="specifics">Compiler/Platform specific topics</a>
-</div>
+</h2>
 <!-- *********************************************************************** -->
 
 <div class="doc_text">
@@ -530,9 +530,9 @@
 
 </div>
 
-<div class="doc_subsection">
+<h3>
   <a name="msvc">Microsoft Visual C++</a>
-</div>
+</h3>
 
 <div class="doc_text">