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/UsingLibraries.html b/docs/UsingLibraries.html
index 28c1e08..e8067ed 100644
--- a/docs/UsingLibraries.html
+++ b/docs/UsingLibraries.html
@@ -5,7 +5,7 @@
   <link rel="stylesheet" href="llvm.css" type="text/css">
 </head>
 <body>
-<div class="doc_title">Using The LLVM Libraries</div>
+<h1>Using The LLVM Libraries</h1>
 <ol>
   <li><a href="#abstract">Abstract</a></li>
   <li><a href="#introduction">Introduction</a></li>
@@ -30,7 +30,7 @@
   guide</a>.</p>
 
 <!-- ======================================================================= -->
-<div class="doc_section"><a name="abstract">Abstract</a></div>
+<h2><a name="abstract">Abstract</a></h2>
 <div class="doc_text">
   <p>Amongst other things, LLVM is a toolkit for building compilers, linkers,
   runtime executives, virtual machines, and other program execution related
@@ -45,7 +45,7 @@
 </div>
 
 <!-- ======================================================================= -->
-<div class="doc_section"> <a name="introduction">Introduction</a></div>
+<h2><a name="introduction">Introduction</a></h2>
 <div class="doc_text">
   <p>If you're writing a compiler, virtual machine, or any other utility based 
   on LLVM, you'll need to figure out which of the many libraries files you will 
@@ -74,7 +74,7 @@
   correct for your tool can sometimes be challenging.
 </div>
 <!-- ======================================================================= -->
-<div class="doc_section"><a name="descriptions"></a>Library Descriptions</div>
+<h2><a name="descriptions">Library Descriptions</a></h2>
 <div class="doc_text">
   <p>The table below categorizes each library
 <table style="text-align:left">
@@ -152,7 +152,7 @@
 </div>
 
 <!-- ======================================================================= -->
-<div class="doc_section"><a name="dependencies"></a>Using llvm-config</div>
+<h2><a name="dependencies">Using llvm-config</a></h2>
 <div class="doc_text">
   <p>The <tt>llvm-config</tt> tool is a perl script that produces on its output
   various kinds of information. For example, the source or object directories 
@@ -401,14 +401,15 @@
 </div>
 
 <!-- ======================================================================= -->
-<div class="doc_section"><a name="rot">Linkage Rules Of Thumb</a></div>
+<h2><a name="rot">Linkage Rules Of Thumb</a></h2>
 <div class="doc_text">
 	<p>This section contains various "rules of thumb" about what files you
 	should link into your programs.</p>
 </div>
 <!-- ======================================================================= -->
-<div class="doc_subsection"><a name="always">Always Link LLVMCore, LLVMSupport,
-    and LLVMSystem</a></div>
+<h3>
+  <a name="always">Always Link LLVMCore, LLVMSupport, and LLVMSystem</a>
+</h3>
 <div class="doc_text">
   <p>No matter what you do with LLVM, the last three entries in the value of 
   your LLVMLIBS make variable should always be: 
@@ -416,8 +417,9 @@
   programs that don't depend on these three.</p>
 </div>
 <!-- ======================================================================= -->
-<div class="doc_subsection"><a name="onlyone">Never link both archive and
-    re-linked library</a></div>
+<h3>
+  <a name="onlyone">Never link both archive and re-linked library</a>
+</h3>
 <div class="doc_text">
   <p>There is never any point to linking both the re-linked (<tt>.o</tt>) and
   the archive (<tt>.a</tt>) versions of a library. Since the re-linked version